My sequenced music were mostly composed on PC with high level sequencer softwares (DAW).
In common audio FLAC & MP3 format, i’ve hosted most of them on Soundcloud.
I’ve used / tried different free DAW like LMMS, Krystal Audio, Reaper (evaluation) or Studio One free.
All musics done for fun & pleasure
My soundchip / chiptune music compositions were done on ATARI ST with softwares (chip trackers) like Megatizer by Sector One or the great maxYMiser by Gwem.
This kind of music creation use directly a sound chip, an integrated circuit designed to produce sound.
No audio sample data used here (except very short drums sometimes)
For ATARI ST ( >35 years old computer ), it’s YM2149 chip that produce sounds.