Bug fixes for SC-8850 hardcoded performance.

src/fakeSc8850/index.js

@@ -22,11 +22,30 @@ let currentPerformance;
 demoModes[9] = "gm";
 let useMidiBus = false;
 
-let generateSwitch = function (ch = 0) {
+let generateSwitch = function (ch = 0, min, max) {
+	if (min != undefined && max == undefined) {
+		console.warn(`Invalid bounds for channel switch generation.`);
+		return;
+	};
+	let data = [67, 16, 73, 11, 0, 0, ch];
+	if (min != undefined) {
+		data.push(Math.floor(Math.log2(max - min + 1)), min);
+	};
+	return {
+		type: 15,
+		track: 0,
+		data
+	};
+};
+let generateString = function (text) {
+	let data = [67, 16, 76, 6, 0, 0];
+	for (let c = 0; c < text.length; c ++) {
+		data.push(text.charCodeAt(c));
+	};
 	return {
 		type: 15,
 		track: 0,
-		data: [67, 16, 73, 11, 0, 0, ch]
+		data
 	};
 };