Piston Collage voice
From Just Solve the File Format Problem
Piston Collage noise is one of the formats for sound clips used in creating songs with the Piston Collage / PxTone music creation program, alongside Piston Collage noise. (More general sound formats like WAV can also be used.)
A Piston Collage voice has 2 oscillators.
Files start with bytes
50 54 56 4F 49 43 45 2D, or "
PTVOICE-" in ASCII.