Add default text for AudioWidgets and MidiWidgets.

src/Core/MIDI_Map.cpp

@@ -405,13 +405,12 @@ struct MIDI_MapDisplay : MidiWidget {
 	}
 
 	void step() override {
-		if (!module)
-			return;
-
-		int mapLen = module->mapLen;
-		for (int id = 0; id < MAX_CHANNELS; id++) {
-			choices[id]->visible = (id < mapLen);
-			separators[id]->visible = (id < mapLen);
+		if (module) {
+			int mapLen = module->mapLen;
+			for (int id = 0; id < MAX_CHANNELS; id++) {
+				choices[id]->visible = (id < mapLen);
+				separators[id]->visible = (id < mapLen);
+			}
 		}
 
 		MidiWidget::step();

src/Core/plugin.hpp

@@ -74,8 +74,10 @@ struct CcChoice : LedDisplayChoice {
 	}
 
 	void step() override {
-		if (!module)
+		if (!module) {
+			text = string::f("%d", id);
 			return;
+		}
 		if (module->learningId == id) {
 			if (0 <= focusCc)
 				text = string::f("%d", focusCc);
@@ -155,8 +157,10 @@ struct NoteChoice : LedDisplayChoice {
 	}
 
 	void step() override {
-		if (!module)
+		if (!module) {
+			text = "C4";
 			return;
+		}
 		if (module->learningId == id) {
 			text = "LRN";
 			color.a = 0.5;

src/app/AudioWidget.cpp

@@ -36,7 +36,7 @@ struct AudioDriverChoice : LedDisplayChoice {
 		if (port)
 			text = port->getDriverName(port->driver);
 		else
-			text = "";
+			text = "Audio driver";
 	}
 };
 
@@ -85,7 +85,7 @@ struct AudioDeviceChoice : LedDisplayChoice {
 	}
 	void step() override {
 		if (!port) {
-			text = "";
+			text = "Audio device";
 			return;
 		}
 		text = port->getDeviceDetail(port->device, port->offset);
@@ -133,7 +133,7 @@ struct AudioSampleRateChoice : LedDisplayChoice {
 		if (port)
 			text = string::f("%g kHz", port->sampleRate / 1000.f);
 		else
-			text = "";
+			text = "44.1 kHz";
 	}
 };
 
@@ -172,7 +172,7 @@ struct AudioBlockSizeChoice : LedDisplayChoice {
 		if (port)
 			text = string::f("%d", port->blockSize);
 		else
-			text = "";
+			text = "256";
 	}
 };
 

src/app/MidiWidget.cpp

@@ -34,7 +34,7 @@ struct MidiDriverChoice : LedDisplayChoice {
 	}
 	void step() override {
 		if (!port) {
-			text = "";
+			text = "MIDI driver";
 			return;
 		}
 		text = port->getDriverName(port->driverId);
@@ -83,7 +83,7 @@ struct MidiDeviceChoice : LedDisplayChoice {
 	}
 	void step() override {
 		if (!port) {
-			text = "";
+			text = "MIDI device";
 			return;
 		}
 		text = port->getDeviceName(port->deviceId);
@@ -126,7 +126,7 @@ struct MidiChannelChoice : LedDisplayChoice {
 		if (port)
 			text = port->getChannelName(port->channel);
 		else
-			text = "";
+			text = "MIDI channel";
 	}
 };