What audio file format does the PORTADISC use for saving files on a computer?
This is not determined by the PORTADISC but by the software application. The PORTADISC outputs 44.1k, 16-bit PCM data which is the same format as CD. You can save this data in whatever file format you choose, as long as the software application supports this. Common file types may include wav, aiff, SDII, etc.