I was writing a song in a treble clef staff. The midi instrument was set to church organ in 1.75c. When I put in a low c note, it would play what seemed an octave too high. The e and f notes before it played fine. When I switched the instrument to grand piano, it played properly. Is this a bug or a feature?
John M Reynolds
The problem is with the way your computer plays MIDI. If you are using a soundfont (https://forum.noteworthycomposer.com/?topic=5067.msg31916#msg31916), the organ stop in question may not extend that low, resulting in the "mixture" pipes playing without the fundamental.