The internal recorder of the GP-3 can store one song. The recording capacity is approximately 500KB per song, which is equivalent to playing "Für Elise" about 30 times.
Note:
- To record multiple songs, please save them to a USB flash drive (commercially available, 32GB or less). Songs are saved as MIDI files (SMF Format 0). Up to 100 songs can be stored on a USB flash drive.
See the "Exporting Your Performance to a USB Flash Drive" section in the GP-3 Owner's Manual: https://www.roland.com/global/support/by_product/gp-3/owners_manuals/ - The internal recorder saves performance data in MIDI format. To save your performance as audio, connect a computer to the USB Computer port and record using a DAW.