I bought this music for a test purpose. https://www.eclassical.com/orchestras/minnesota-orchestra/mahler-symphony-no1.html
This is a 6-channel (actual 5) reproduction in FLAC format. Yamaha A680 specs are FLAC: up to 192 kHz / 24-bit, and music files are 24-bit, 96 kHz.
Yamaha does not recognize...