From a62f3006efeaa8ecb203fa08ac26c74c748129b7 Mon Sep 17 00:00:00 2001
From: Raphael Forment <raphael.forment@gmail.com>
Date: Sat, 5 Aug 2023 21:30:30 +0200
Subject: [PATCH] Adding MIDI Program Change

---
 src/API.ts               | 10 ++++++++++
 src/IO/MidiConnection.ts | 21 +++++++++++++++++++++
 2 files changed, 31 insertions(+)

diff --git a/src/API.ts b/src/API.ts
index f40765b..8a0d20c 100644
--- a/src/API.ts
+++ b/src/API.ts
@@ -231,6 +231,16 @@ export class UserAPI {
         this.MidiConnection.sendSysExMessage(data)
     }
 
+    public program_change(program: number, channel: number): void {
+        /**
+         * Sends a MIDI program change to the current MIDI output.
+         * 
+         * @param program - The MIDI program to send
+         * @param channel - The MIDI channel to send the program change on
+         */
+        this.MidiConnection.sendProgramChange(program, channel)
+    }
+
     public midi_clock(): void {
         /**
          * Sends a MIDI clock to the current MIDI output.
diff --git a/src/IO/MidiConnection.ts b/src/IO/MidiConnection.ts
index d6c70dc..5109a3b 100644
--- a/src/IO/MidiConnection.ts
+++ b/src/IO/MidiConnection.ts
@@ -137,6 +137,27 @@ export class MidiConnection{
         console.error('MIDI output not available.');
       }
     }
+
+    public sendProgramChange(programNumber: number, channel: number): void {
+      /**
+       * Sends a MIDI Program Change message to the currently selected MIDI output.
+       * 
+       * @param programNumber MIDI program number (0-127)
+       * @param channel MIDI channel (0-15)
+       * 
+       * @example
+       * // Send a Program Change message to select program 1 on channel 1
+       * sendProgramChange(0, 0);
+       */
+      const output = this.midiOutputs[this.currentOutputIndex];
+      if (output) {
+        output.send([0xC0 + channel, programNumber]); // Program Change
+      } else {
+        console.error('MIDI output not available.');
+      }
+    }
+
+
   
     public sendMidiControlChange(controlNumber: number, value: number): void {
       /**