Karsten Wiese <annabellesgarden@yahoo.de>:

This has more features:
- PCM-Volume adjusted to MasteVolumeSlider setting at device start.
- Direct Monitoring Functions adjustable directly on the US428
- Alsa Sequencer Output port for applications to receive the US428 sliders
etc.

us428control/Cus428Midi.h

@@ -0,0 +1,52 @@
+#include <sound/asequencer.h>
+#include "Cus428State.h"
+
+class Cus428Midi {
+ public:
+	Cus428Midi():
+		Seq(0){}
+
+	int CreatePorts(){
+		int Err;
+		if (0 <= (Err = snd_seq_open(&Seq, "default", SND_SEQ_OPEN_DUPLEX, SND_SEQ_NONBLOCK))) {
+			snd_seq_set_client_name(Seq, "US-428");
+			Err = snd_seq_create_simple_port(Seq, "Controls",
+							 SNDRV_SEQ_PORT_CAP_READ
+							 //|SNDRV_SEQ_PORT_CAP_WRITE	FIXME: Next Step is to make Lights switchable
+							 |SNDRV_SEQ_PORT_CAP_SUBS_READ
+							 /*|SNDRV_SEQ_PORT_CAP_SUBS_WRITE*/,
+							 SNDRV_SEQ_PORT_TYPE_MIDI_GENERIC);
+			if (Err >= 0) {
+				Port = Err;
+				snd_seq_ev_clear(&Ev);
+				snd_seq_ev_set_direct(&Ev);
+				snd_seq_ev_set_source(&Ev, Port);
+				snd_seq_ev_set_subs(&Ev);
+			}
+		}
+		return Err;
+	}
+
+	int SendMidiControl(char Param, char Val){
+		snd_seq_ev_set_controller(&Ev, 15, Param, Val & 0x7F);
+		SubMitEvent();
+		return 0;
+	} 
+
+	int SendMidiControl(Cus428State::eKnobs K, bool Down){
+		return SendMidiControl(KnobParam[K - Cus428State::eK_RECORD], Down ? 0x7F : 0);
+	}
+
+ private:
+	snd_seq_t *Seq;
+	int Port;
+	snd_seq_event_t Ev;
+	int SubMitEvent(){
+		snd_seq_event_output(Seq, &Ev);
+		snd_seq_drain_output(Seq);
+		return 0;
+	}
+	static char KnobParam[];
+};
+
+extern Cus428Midi Midi;