Soundfont Library
"The high notes sound like chipmunks." Solution: The library lacks "key range" samples. The player is stretching a low C sample up four octaves. You need a better-quality library (like Fluid R3) that has samples every 3rd note.
: A single .sf2 file can hold an entire General MIDI (GM) bank, making it easy to share projects across different platforms. soundfont library
: This free notation software uses soundfont libraries to provide realistic playback for composers. "The high notes sound like chipmunks