A couple #chiptune songs from a later #Queentex #POPStation (there are many more built into the ROM, a random one is chosen on cold or warm boot). POP Stations were actually capable of polyphonic and sampled sound before the hardware and software were simplified after Queentex went out of business. There are other POP Stations that add sampled and/or polyphonic sound capabilities back to the platform, however these are entirely unrelated to the original implementation as far as I am aware.