diff --git a/app/call_centers/waveform.php b/app/call_centers/waveform.php
index f51a6a97fc..0c93872262 100644
--- a/app/call_centers/waveform.php
+++ b/app/call_centers/waveform.php
@@ -96,8 +96,8 @@
 				Waveform::$colorB = !empty($_SESSION['theme']['audio_player_waveform_color_b_leg']['text']) ? color_to_rgba_array($_SESSION['theme']['audio_player_waveform_color_b_leg']['text']) : [0,125,232,0.6]; // array rgba, right (b-leg) wave color
 				Waveform::$backgroundColor = !empty($_SESSION['theme']['audio_player_waveform_color_background']['text']) ? color_to_rgba_array($_SESSION['theme']['audio_player_waveform_color_background']['text']) : [0,0,0,0]; // array rgba, default: transparent
 				Waveform::$axisColor = !empty($_SESSION['theme']['audio_player_waveform_color_axis']['text']) ? color_to_rgba_array($_SESSION['theme']['audio_player_waveform_color_axis']['text']) : [0,0,0,0.3]; // array rgba
-				Waveform::$singlePhase = filter_var($_SESSION['theme']['audio_player_waveform_single_phase']['boolean'] ?? false, FILTER_VALIDATE_BOOL); // positive phase only - left (a-leg) top, right (b-leg) bottom
-				Waveform::$singleAxis = filter_var($_SESSION['theme']['audio_player_waveform_single_axis']['boolean'] ?? false, FILTER_VALIDATE_BOOL); // combine channels into single axis
+				Waveform::$singlePhase = filter_var($_SESSION['theme']['audio_player_waveform_single_phase']['boolean'] ?? false, FILTER_VALIDATE_BOOL) ? 'true': 'false'; // positive phase only - left (a-leg) top, right (b-leg) bottom
+				Waveform::$singleAxis = filter_var($_SESSION['theme']['audio_player_waveform_single_axis']['boolean'] ?? true, FILTER_VALIDATE_BOOL) ? 'true': 'false'; // combine channels into single axis
 				$height = !empty($_SESSION['theme']['audio_player_waveform_height']['text']) && is_numeric(str_replace('px','',$_SESSION['theme']['audio_player_waveform_height']['text'])) ? 2.2 * (int) str_replace('px','',$_SESSION['theme']['audio_player_waveform_height']['text']) : null;
 				$wf = $waveform->getWaveform($temp_filename, 1600, $height ?? 180); // input: png filename returns boolean true/false, or 'base64' returns base64 string
 			}
diff --git a/app/call_flows/waveform.php b/app/call_flows/waveform.php
index f51a6a97fc..0c93872262 100644
--- a/app/call_flows/waveform.php
+++ b/app/call_flows/waveform.php
@@ -96,8 +96,8 @@
 				Waveform::$colorB = !empty($_SESSION['theme']['audio_player_waveform_color_b_leg']['text']) ? color_to_rgba_array($_SESSION['theme']['audio_player_waveform_color_b_leg']['text']) : [0,125,232,0.6]; // array rgba, right (b-leg) wave color
 				Waveform::$backgroundColor = !empty($_SESSION['theme']['audio_player_waveform_color_background']['text']) ? color_to_rgba_array($_SESSION['theme']['audio_player_waveform_color_background']['text']) : [0,0,0,0]; // array rgba, default: transparent
 				Waveform::$axisColor = !empty($_SESSION['theme']['audio_player_waveform_color_axis']['text']) ? color_to_rgba_array($_SESSION['theme']['audio_player_waveform_color_axis']['text']) : [0,0,0,0.3]; // array rgba
-				Waveform::$singlePhase = filter_var($_SESSION['theme']['audio_player_waveform_single_phase']['boolean'] ?? false, FILTER_VALIDATE_BOOL); // positive phase only - left (a-leg) top, right (b-leg) bottom
-				Waveform::$singleAxis = filter_var($_SESSION['theme']['audio_player_waveform_single_axis']['boolean'] ?? false, FILTER_VALIDATE_BOOL); // combine channels into single axis
+				Waveform::$singlePhase = filter_var($_SESSION['theme']['audio_player_waveform_single_phase']['boolean'] ?? false, FILTER_VALIDATE_BOOL) ? 'true': 'false'; // positive phase only - left (a-leg) top, right (b-leg) bottom
+				Waveform::$singleAxis = filter_var($_SESSION['theme']['audio_player_waveform_single_axis']['boolean'] ?? true, FILTER_VALIDATE_BOOL) ? 'true': 'false'; // combine channels into single axis
 				$height = !empty($_SESSION['theme']['audio_player_waveform_height']['text']) && is_numeric(str_replace('px','',$_SESSION['theme']['audio_player_waveform_height']['text'])) ? 2.2 * (int) str_replace('px','',$_SESSION['theme']['audio_player_waveform_height']['text']) : null;
 				$wf = $waveform->getWaveform($temp_filename, 1600, $height ?? 180); // input: png filename returns boolean true/false, or 'base64' returns base64 string
 			}
diff --git a/app/call_recordings/waveform.php b/app/call_recordings/waveform.php
index b161b6614d..8e3b52be6a 100644
--- a/app/call_recordings/waveform.php
+++ b/app/call_recordings/waveform.php
@@ -84,8 +84,8 @@
 				Waveform::$colorB = !empty($_SESSION['theme']['audio_player_waveform_color_b_leg']['text']) ? color_to_rgba_array($_SESSION['theme']['audio_player_waveform_color_b_leg']['text']) : [0,125,232,0.6]; // array rgba, right (b-leg) wave color
 				Waveform::$backgroundColor = !empty($_SESSION['theme']['audio_player_waveform_color_background']['text']) ? color_to_rgba_array($_SESSION['theme']['audio_player_waveform_color_background']['text']) : [0,0,0,0]; // array rgba, default: transparent
 				Waveform::$axisColor = !empty($_SESSION['theme']['audio_player_waveform_color_axis']['text']) ? color_to_rgba_array($_SESSION['theme']['audio_player_waveform_color_axis']['text']) : [0,0,0,0.3]; // array rgba
-				Waveform::$singlePhase = filter_var($_SESSION['theme']['audio_player_waveform_single_phase']['boolean'] ?? false, FILTER_VALIDATE_BOOL); // positive phase only - left (a-leg) top, right (b-leg) bottom
-				Waveform::$singleAxis = filter_var($_SESSION['theme']['audio_player_waveform_single_axis']['boolean'] ?? false, FILTER_VALIDATE_BOOL); // combine channels into single axis
+				Waveform::$singlePhase = filter_var($_SESSION['theme']['audio_player_waveform_single_phase']['boolean'] ?? false, FILTER_VALIDATE_BOOL) ? 'true': 'false'; // positive phase only - left (a-leg) top, right (b-leg) bottom
+				Waveform::$singleAxis = filter_var($_SESSION['theme']['audio_player_waveform_single_axis']['boolean'] ?? true, FILTER_VALIDATE_BOOL) ? 'true': 'false'; // combine channels into single axis
 				$height = !empty($_SESSION['theme']['audio_player_waveform_height']['text']) && is_numeric(str_replace('px','',$_SESSION['theme']['audio_player_waveform_height']['text'])) ? 2.2 * (int) str_replace('px','',$_SESSION['theme']['audio_player_waveform_height']['text']) : null;
 				$wf = $waveform->getWaveform($temp_filename, 1600, $height ?? 180); // input: png filename returns boolean true/false, or 'base64' returns base64 string
 			}
diff --git a/app/conference_centers/waveform.php b/app/conference_centers/waveform.php
index f51a6a97fc..0c93872262 100644
--- a/app/conference_centers/waveform.php
+++ b/app/conference_centers/waveform.php
@@ -96,8 +96,8 @@
 				Waveform::$colorB = !empty($_SESSION['theme']['audio_player_waveform_color_b_leg']['text']) ? color_to_rgba_array($_SESSION['theme']['audio_player_waveform_color_b_leg']['text']) : [0,125,232,0.6]; // array rgba, right (b-leg) wave color
 				Waveform::$backgroundColor = !empty($_SESSION['theme']['audio_player_waveform_color_background']['text']) ? color_to_rgba_array($_SESSION['theme']['audio_player_waveform_color_background']['text']) : [0,0,0,0]; // array rgba, default: transparent
 				Waveform::$axisColor = !empty($_SESSION['theme']['audio_player_waveform_color_axis']['text']) ? color_to_rgba_array($_SESSION['theme']['audio_player_waveform_color_axis']['text']) : [0,0,0,0.3]; // array rgba
-				Waveform::$singlePhase = filter_var($_SESSION['theme']['audio_player_waveform_single_phase']['boolean'] ?? false, FILTER_VALIDATE_BOOL); // positive phase only - left (a-leg) top, right (b-leg) bottom
-				Waveform::$singleAxis = filter_var($_SESSION['theme']['audio_player_waveform_single_axis']['boolean'] ?? false, FILTER_VALIDATE_BOOL); // combine channels into single axis
+				Waveform::$singlePhase = filter_var($_SESSION['theme']['audio_player_waveform_single_phase']['boolean'] ?? false, FILTER_VALIDATE_BOOL) ? 'true': 'false'; // positive phase only - left (a-leg) top, right (b-leg) bottom
+				Waveform::$singleAxis = filter_var($_SESSION['theme']['audio_player_waveform_single_axis']['boolean'] ?? true, FILTER_VALIDATE_BOOL) ? 'true': 'false'; // combine channels into single axis
 				$height = !empty($_SESSION['theme']['audio_player_waveform_height']['text']) && is_numeric(str_replace('px','',$_SESSION['theme']['audio_player_waveform_height']['text'])) ? 2.2 * (int) str_replace('px','',$_SESSION['theme']['audio_player_waveform_height']['text']) : null;
 				$wf = $waveform->getWaveform($temp_filename, 1600, $height ?? 180); // input: png filename returns boolean true/false, or 'base64' returns base64 string
 			}
diff --git a/app/ivr_menus/waveform.php b/app/ivr_menus/waveform.php
index f51a6a97fc..0c93872262 100644
--- a/app/ivr_menus/waveform.php
+++ b/app/ivr_menus/waveform.php
@@ -96,8 +96,8 @@
 				Waveform::$colorB = !empty($_SESSION['theme']['audio_player_waveform_color_b_leg']['text']) ? color_to_rgba_array($_SESSION['theme']['audio_player_waveform_color_b_leg']['text']) : [0,125,232,0.6]; // array rgba, right (b-leg) wave color
 				Waveform::$backgroundColor = !empty($_SESSION['theme']['audio_player_waveform_color_background']['text']) ? color_to_rgba_array($_SESSION['theme']['audio_player_waveform_color_background']['text']) : [0,0,0,0]; // array rgba, default: transparent
 				Waveform::$axisColor = !empty($_SESSION['theme']['audio_player_waveform_color_axis']['text']) ? color_to_rgba_array($_SESSION['theme']['audio_player_waveform_color_axis']['text']) : [0,0,0,0.3]; // array rgba
-				Waveform::$singlePhase = filter_var($_SESSION['theme']['audio_player_waveform_single_phase']['boolean'] ?? false, FILTER_VALIDATE_BOOL); // positive phase only - left (a-leg) top, right (b-leg) bottom
-				Waveform::$singleAxis = filter_var($_SESSION['theme']['audio_player_waveform_single_axis']['boolean'] ?? false, FILTER_VALIDATE_BOOL); // combine channels into single axis
+				Waveform::$singlePhase = filter_var($_SESSION['theme']['audio_player_waveform_single_phase']['boolean'] ?? false, FILTER_VALIDATE_BOOL) ? 'true': 'false'; // positive phase only - left (a-leg) top, right (b-leg) bottom
+				Waveform::$singleAxis = filter_var($_SESSION['theme']['audio_player_waveform_single_axis']['boolean'] ?? true, FILTER_VALIDATE_BOOL) ? 'true': 'false'; // combine channels into single axis
 				$height = !empty($_SESSION['theme']['audio_player_waveform_height']['text']) && is_numeric(str_replace('px','',$_SESSION['theme']['audio_player_waveform_height']['text'])) ? 2.2 * (int) str_replace('px','',$_SESSION['theme']['audio_player_waveform_height']['text']) : null;
 				$wf = $waveform->getWaveform($temp_filename, 1600, $height ?? 180); // input: png filename returns boolean true/false, or 'base64' returns base64 string
 			}
diff --git a/app/music_on_hold/waveform.php b/app/music_on_hold/waveform.php
index b2bea9c34c..68087e5dde 100644
--- a/app/music_on_hold/waveform.php
+++ b/app/music_on_hold/waveform.php
@@ -87,8 +87,8 @@
 				Waveform::$colorB = !empty($_SESSION['theme']['audio_player_waveform_color_b_leg']['text']) ? color_to_rgba_array($_SESSION['theme']['audio_player_waveform_color_b_leg']['text']) : [0,125,232,0.6]; // array rgba, right (b-leg) wave color
 				Waveform::$backgroundColor = !empty($_SESSION['theme']['audio_player_waveform_color_background']['text']) ? color_to_rgba_array($_SESSION['theme']['audio_player_waveform_color_background']['text']) : [0,0,0,0]; // array rgba, default: transparent
 				Waveform::$axisColor = !empty($_SESSION['theme']['audio_player_waveform_color_axis']['text']) ? color_to_rgba_array($_SESSION['theme']['audio_player_waveform_color_axis']['text']) : [0,0,0,0.3]; // array rgba
-				Waveform::$singlePhase = filter_var($_SESSION['theme']['audio_player_waveform_single_phase']['boolean'] ?? false, FILTER_VALIDATE_BOOL); // positive phase only - left (a-leg) top, right (b-leg) bottom
-				Waveform::$singleAxis = Waveform::$singlePhase === true ? false : (filter_var($_SESSION['theme']['audio_player_waveform_single_axis']['boolean'] ?? false, FILTER_VALIDATE_BOOL)); // combine channels into single axis
+				Waveform::$singlePhase = filter_var($_SESSION['theme']['audio_player_waveform_single_phase']['boolean'] ?? false, FILTER_VALIDATE_BOOL) ? 'true': 'false'; // positive phase only - left (a-leg) top, right (b-leg) bottom
+				Waveform::$singleAxis = Waveform::$singlePhase === true ? false : (filter_var($_SESSION['theme']['audio_player_waveform_single_axis']['boolean'] ?? false, FILTER_VALIDATE_BOOL) ? 'true': 'false'); // combine channels into single axis
 				$height = !empty($_SESSION['theme']['audio_player_waveform_height']['text']) && is_numeric(str_replace('px','',$_SESSION['theme']['audio_player_waveform_height']['text'])) ? 2.2 * (int) str_replace('px','',$_SESSION['theme']['audio_player_waveform_height']['text']) : null;
 				$wf = $waveform->getWaveform($temp_filename, 1600, $height ?? 180); // input: png filename returns boolean true/false, or 'base64' returns base64 string
 			}
diff --git a/app/recordings/waveform.php b/app/recordings/waveform.php
index a1729c5384..f5136b2927 100644
--- a/app/recordings/waveform.php
+++ b/app/recordings/waveform.php
@@ -94,8 +94,8 @@
 				Waveform::$colorB = !empty($_SESSION['theme']['audio_player_waveform_color_b_leg']['text']) ? color_to_rgba_array($_SESSION['theme']['audio_player_waveform_color_b_leg']['text']) : [0,125,232,0.6]; // array rgba, right (b-leg) wave color
 				Waveform::$backgroundColor = !empty($_SESSION['theme']['audio_player_waveform_color_background']['text']) ? color_to_rgba_array($_SESSION['theme']['audio_player_waveform_color_background']['text']) : [0,0,0,0]; // array rgba, default: transparent
 				Waveform::$axisColor = !empty($_SESSION['theme']['audio_player_waveform_color_axis']['text']) ? color_to_rgba_array($_SESSION['theme']['audio_player_waveform_color_axis']['text']) : [0,0,0,0.3]; // array rgba
-				Waveform::$singlePhase = filter_var($_SESSION['theme']['audio_player_waveform_single_phase']['boolean'] ?? false, FILTER_VALIDATE_BOOL); // positive phase only - left (a-leg) top, right (b-leg) bottom
-				Waveform::$singleAxis = filter_var($_SESSION['theme']['audio_player_waveform_single_axis']['boolean'] ?? false, FILTER_VALIDATE_BOOL); // combine channels into single axis
+				Waveform::$singlePhase = filter_var($_SESSION['theme']['audio_player_waveform_single_phase']['boolean'] ?? false, FILTER_VALIDATE_BOOL) ? 'true': 'false'; // positive phase only - left (a-leg) top, right (b-leg) bottom
+				Waveform::$singleAxis = filter_var($_SESSION['theme']['audio_player_waveform_single_axis']['boolean'] ?? true, FILTER_VALIDATE_BOOL) ? 'true': 'false'; // combine channels into single axis
 				$height = !empty($_SESSION['theme']['audio_player_waveform_height']['text']) && is_numeric(str_replace('px','',$_SESSION['theme']['audio_player_waveform_height']['text'])) ? 2.2 * (int) str_replace('px','',$_SESSION['theme']['audio_player_waveform_height']['text']) : null;
 				$wf = $waveform->getWaveform($temp_filename, 1600, $height ?? 180); // input: png filename returns boolean true/false, or 'base64' returns base64 string
 			}
diff --git a/app/ring_groups/waveform.php b/app/ring_groups/waveform.php
index f51a6a97fc..0c93872262 100644
--- a/app/ring_groups/waveform.php
+++ b/app/ring_groups/waveform.php
@@ -96,8 +96,8 @@
 				Waveform::$colorB = !empty($_SESSION['theme']['audio_player_waveform_color_b_leg']['text']) ? color_to_rgba_array($_SESSION['theme']['audio_player_waveform_color_b_leg']['text']) : [0,125,232,0.6]; // array rgba, right (b-leg) wave color
 				Waveform::$backgroundColor = !empty($_SESSION['theme']['audio_player_waveform_color_background']['text']) ? color_to_rgba_array($_SESSION['theme']['audio_player_waveform_color_background']['text']) : [0,0,0,0]; // array rgba, default: transparent
 				Waveform::$axisColor = !empty($_SESSION['theme']['audio_player_waveform_color_axis']['text']) ? color_to_rgba_array($_SESSION['theme']['audio_player_waveform_color_axis']['text']) : [0,0,0,0.3]; // array rgba
-				Waveform::$singlePhase = filter_var($_SESSION['theme']['audio_player_waveform_single_phase']['boolean'] ?? false, FILTER_VALIDATE_BOOL); // positive phase only - left (a-leg) top, right (b-leg) bottom
-				Waveform::$singleAxis = filter_var($_SESSION['theme']['audio_player_waveform_single_axis']['boolean'] ?? false, FILTER_VALIDATE_BOOL); // combine channels into single axis
+				Waveform::$singlePhase = filter_var($_SESSION['theme']['audio_player_waveform_single_phase']['boolean'] ?? false, FILTER_VALIDATE_BOOL) ? 'true': 'false'; // positive phase only - left (a-leg) top, right (b-leg) bottom
+				Waveform::$singleAxis = filter_var($_SESSION['theme']['audio_player_waveform_single_axis']['boolean'] ?? true, FILTER_VALIDATE_BOOL) ? 'true': 'false'; // combine channels into single axis
 				$height = !empty($_SESSION['theme']['audio_player_waveform_height']['text']) && is_numeric(str_replace('px','',$_SESSION['theme']['audio_player_waveform_height']['text'])) ? 2.2 * (int) str_replace('px','',$_SESSION['theme']['audio_player_waveform_height']['text']) : null;
 				$wf = $waveform->getWaveform($temp_filename, 1600, $height ?? 180); // input: png filename returns boolean true/false, or 'base64' returns base64 string
 			}
diff --git a/app/voicemail_greetings/waveform.php b/app/voicemail_greetings/waveform.php
index acce66c0ba..59e8032d78 100644
--- a/app/voicemail_greetings/waveform.php
+++ b/app/voicemail_greetings/waveform.php
@@ -103,8 +103,8 @@
 				Waveform::$colorB = !empty($_SESSION['theme']['audio_player_waveform_color_b_leg']['text']) ? color_to_rgba_array($_SESSION['theme']['audio_player_waveform_color_b_leg']['text']) : [0,125,232,0.6]; // array rgba, right (b-leg) wave color
 				Waveform::$backgroundColor = !empty($_SESSION['theme']['audio_player_waveform_color_background']['text']) ? color_to_rgba_array($_SESSION['theme']['audio_player_waveform_color_background']['text']) : [0,0,0,0]; // array rgba, default: transparent
 				Waveform::$axisColor = !empty($_SESSION['theme']['audio_player_waveform_color_axis']['text']) ? color_to_rgba_array($_SESSION['theme']['audio_player_waveform_color_axis']['text']) : [0,0,0,0.3]; // array rgba
-				Waveform::$singlePhase = filter_var($_SESSION['theme']['audio_player_waveform_single_phase']['boolean'] ?? false, FILTER_VALIDATE_BOOL); // positive phase only - left (a-leg) top, right (b-leg) bottom
-				Waveform::$singleAxis = filter_var($_SESSION['theme']['audio_player_waveform_single_axis']['boolean'] ?? false, FILTER_VALIDATE_BOOL); // combine channels into single axis
+				Waveform::$singlePhase = filter_var($_SESSION['theme']['audio_player_waveform_single_phase']['boolean'] ?? false, FILTER_VALIDATE_BOOL) ? 'true': 'false'; // positive phase only - left (a-leg) top, right (b-leg) bottom
+				Waveform::$singleAxis = filter_var($_SESSION['theme']['audio_player_waveform_single_axis']['boolean'] ?? true, FILTER_VALIDATE_BOOL) ? 'true': 'false'; // combine channels into single axis
 				$height = !empty($_SESSION['theme']['audio_player_waveform_height']['text']) && is_numeric(str_replace('px','',$_SESSION['theme']['audio_player_waveform_height']['text'])) ? 2.2 * (int) str_replace('px','',$_SESSION['theme']['audio_player_waveform_height']['text']) : null;
 				$wf = $waveform->getWaveform($greeting_dir.'/'.$temp_filename, 1600, $height ?? 180); // input: png filename returns boolean true/false, or 'base64' returns base64 string
 			}
diff --git a/app/voicemails/waveform.php b/app/voicemails/waveform.php
index 23362971b3..645ef6c003 100644
--- a/app/voicemails/waveform.php
+++ b/app/voicemails/waveform.php
@@ -225,8 +225,8 @@
 				Waveform::$colorB = !empty($_SESSION['theme']['audio_player_waveform_color_b_leg']['text']) ? color_to_rgba_array($_SESSION['theme']['audio_player_waveform_color_b_leg']['text']) : [0,125,232,0.6]; // array rgba, right (b-leg) wave color
 				Waveform::$backgroundColor = !empty($_SESSION['theme']['audio_player_waveform_color_background']['text']) ? color_to_rgba_array($_SESSION['theme']['audio_player_waveform_color_background']['text']) : [0,0,0,0]; // array rgba, default: transparent
 				Waveform::$axisColor = !empty($_SESSION['theme']['audio_player_waveform_color_axis']['text']) ? color_to_rgba_array($_SESSION['theme']['audio_player_waveform_color_axis']['text']) : [0,0,0,0.3]; // array rgba
-				Waveform::$singlePhase = filter_var($_SESSION['theme']['audio_player_waveform_single_phase']['boolean'] ?? false, FILTER_VALIDATE_BOOL); // positive phase only - left (a-leg) top, right (b-leg) bottom
-				Waveform::$singleAxis = filter_var($_SESSION['theme']['audio_player_waveform_single_axis']['boolean'] ?? false, FILTER_VALIDATE_BOOL); // combine channels into single axis
+				Waveform::$singlePhase = filter_var($_SESSION['theme']['audio_player_waveform_single_phase']['boolean'] ?? false, FILTER_VALIDATE_BOOL) ? 'true': 'false'; // positive phase only - left (a-leg) top, right (b-leg) bottom
+				Waveform::$singleAxis = filter_var($_SESSION['theme']['audio_player_waveform_single_axis']['boolean'] ?? true, FILTER_VALIDATE_BOOL) ? 'true': 'false'; // combine channels into single axis
 				$height = !empty($_SESSION['theme']['audio_player_waveform_height']['text']) && is_numeric(str_replace('px','',$_SESSION['theme']['audio_player_waveform_height']['text'])) ? 2.2 * (int) str_replace('px','',$_SESSION['theme']['audio_player_waveform_height']['text']) : null;
 				$wf = $waveform->getWaveform($temp_filename, 1600, $height ?? 180); // input: png filename returns boolean true/false, or 'base64' returns base64 string
 			}
diff --git a/app/xml_cdr/waveform.php b/app/xml_cdr/waveform.php
index a5bab7ce54..b37c596109 100644
--- a/app/xml_cdr/waveform.php
+++ b/app/xml_cdr/waveform.php
@@ -84,8 +84,8 @@
 				Waveform::$colorB = !empty($_SESSION['theme']['audio_player_waveform_color_b_leg']['text']) ? color_to_rgba_array($_SESSION['theme']['audio_player_waveform_color_b_leg']['text']) : [0,125,232,0.6]; // array rgba, right (b-leg) wave color
 				Waveform::$backgroundColor = !empty($_SESSION['theme']['audio_player_waveform_color_background']['text']) ? color_to_rgba_array($_SESSION['theme']['audio_player_waveform_color_background']['text']) : [0,0,0,0]; // array rgba, default: transparent
 				Waveform::$axisColor = !empty($_SESSION['theme']['audio_player_waveform_color_axis']['text']) ? color_to_rgba_array($_SESSION['theme']['audio_player_waveform_color_axis']['text']) : [0,0,0,0.3]; // array rgba
-				Waveform::$singlePhase = filter_var($_SESSION['theme']['audio_player_waveform_single_phase']['boolean'] ?? false, FILTER_VALIDATE_BOOL); // positive phase only - left (a-leg) top, right (b-leg) bottom
-				Waveform::$singleAxis = filter_var($_SESSION['theme']['audio_player_waveform_single_axis']['boolean'] ?? false, FILTER_VALIDATE_BOOL); // combine channels into single axis
+				Waveform::$singlePhase = filter_var($_SESSION['theme']['audio_player_waveform_single_phase']['boolean'] ?? false, FILTER_VALIDATE_BOOL) ? 'true': 'false'; // positive phase only - left (a-leg) top, right (b-leg) bottom
+				Waveform::$singleAxis = filter_var($_SESSION['theme']['audio_player_waveform_single_axis']['boolean'] ?? true, FILTER_VALIDATE_BOOL) ? 'true': 'false'; // combine channels into single axis
 				$height = !empty($_SESSION['theme']['audio_player_waveform_height']['text']) && is_numeric(str_replace('px','',$_SESSION['theme']['audio_player_waveform_height']['text'])) ? 2.2 * (int) str_replace('px','',$_SESSION['theme']['audio_player_waveform_height']['text']) : null;
 				$wf = $waveform->getWaveform($temp_filename, 1600, $height ?? 180); // input: png filename returns boolean true/false, or 'base64' returns base64 string
 			}