Well...the VIM can do up to 8 channels via I2S/TDM, but the Tone Board (TONE1) doesn't expose its I2S in a way that it can be used without either hardware modification or custom firmware - see
#214 for details. I assume this is what
@Gouwa wanted to ask the team about, and why hyphop
responded suggesting an alsa virtual multichannel configuration (with potential clock drift problems we might want to measure) or a proper multichannel interface like the MOTU 8A. You could use the VIM with other TDM capable DAC boards/hats, but we would have to identify some with good performance. There are other SBCs with TDM capability, like the BeagleBone Black, although that may be a poor example given its limited CPU.