some improvements/fixes to the MIDI and NBS converter

src/main/java/com/github/hhhzzzsss/songplayer/conversion/MidiConverter.java

@@ -16,6 +16,7 @@ import java.nio.file.Paths;
 import java.security.KeyManagementException;
 import java.security.NoSuchAlgorithmException;
 import java.util.ArrayList;
+import java.util.Arrays;
 import java.util.Collections;
 import java.util.HashMap;
 
@@ -141,6 +142,32 @@ public class MidiConverter {
 					break;
 				}
 			}
+
+			if (instrument == null) {
+//        instrument = instrumentList[0];
+
+				// we are finding the closest instrument offset here and use that
+				// closest instrument as the instrument
+
+				final Integer[] offsets = Arrays.stream(instrumentList).map(ins -> ins.offset).toArray(Integer[]::new);
+
+				// https://stackoverflow.com/questions/13318733/get-closest-value-to-a-number-in-array
+				int distance = Math.abs(offsets[0] - midiPitch);
+				int idx = 0;
+				for (int c = 1; c < offsets.length; c++) {
+					int cdistance = Math.abs(offsets[c] - midiPitch);
+					if (cdistance < distance) {
+						idx = c;
+						distance = cdistance;
+					}
+				}
+
+				final int closest = offsets[idx];
+
+				instrument = Arrays.stream(instrumentList)
+						.filter(ins -> ins.offset == closest)
+						.toArray(Instrument[]::new)[0];
+			}
 		}
 
 		if (instrument == null) {

src/main/java/com/github/hhhzzzsss/songplayer/conversion/NBSConverter.java

@@ -153,7 +153,7 @@ public class NBSConverter {
                 layerVolume = nbsLayers.get(note.layer).volume;
             }
 
-            int key = note.key + SongHandler.getInstance().pitch;
+            int key = (note.key + (note.pitch / 100)) + SongHandler.getInstance().pitch;
 
             while (key < 33) key += 12;
             while (key > 57) key -= 12;