I’m using the Fostex HPA4 headphone amp connected to Audeze LCD-2C.
This setup has always worked fine on my Mac up to and including Sonoma (macOS 14, the current version my iMac is on).
However, Fostex say that the amp is not supported on Sequoia. It seems ambiguous and they might mean that the HPA4 has not been verified/tested to work on macOS 15 or beyond.
So my question is: can anyone with a fostex HPA4 or equivalent verify if it works on Sequoia?
Note that I only use PCM input via USB, not Optical.