So, I made a softsynth for a school project. We had to make a music/sound clip, but it had to make use of a provided short flute sample. I ended up resynthesizing a flute-ish pad sound with white noise and an IIR filter of crazy length. The IIR filter was derived with linear prediction.
The clip is here: https://soundcloud.com/zoned-music/brea … -sound-wip Source: https://github.com/Themaister/airsynth. Runs on ALSA (MIDI and sound).