Pro Tools 2021.6 removes 32ch I/O restriction and now supports up to 64ch without needing an HDX or HD Native card!

With the release of Pro Tools 2021.6 in June 2021, there is no longer a 32ch I/O restriction for non-HD interfaces.

Previously if you wanted to use two Apogee Symphony I/O or MkII units together for up to 64ch, you had to connect with a PC-32 cable to an Avid HDX or HD Native card.

Now, the HDX or HD Native card is not needed. Any Apple CoreAudio interface can get up to 64ch of I/O. This allows Apogee customers to enjoy full use of their superior Symphony I/O converters with Pro Tools.

See this article for more on this new Pro Tools software release: