Issues with the Audio Midi setup on macOS Sonoma 14.3.1.

Thanks for response

Re 1. There are no drivers this is a usb class compliant device so it just uses core audio on the Mac.

Re 2. Tried this step, but first set the Tascam PCX8 audio device to 44100 16bit saved and turned off. Then I deleted the plist file as suggested and reopened Audio Midi app. Then I turned on the Tascam and the interface details appeared in Audio Midi app but as it still did not show the 16bit options. Its default chosen setting was 24bit 44100 so it immediately generated an error on the audio interface of FS mismatch (Sample rate mismatch detected). Clearly the Mac data chosen by Sonoma was being read by the device to produce that error, but the Mac did not seem to be reading the device as it set the sample rate incorrectly in the first place.

Now I have no way of knowing why the Mac chose the rate it did so still unable to identify where the fault lies, Apple or Tascam. Id need to see the program logic which is going to be impossible. Logic points me at Apple as the Mac seem to auto choose an incorrect setting. The programmers themselves would know but I can only get to front desk so will be unable to resolve without both parties digging into this. So far unfortunately the support is far from supportive. This response is the best Ive had. Tascams support has only been read the manual and its probably the software Im using not their problem. I did read their manual from cover to cover before even raising this incompatibility issue.

So this community is the start of my Apple support adventure.

Re 3 System Preference on Sonoma only gives me the Sound Menu as far as I can see under that the PCX8 is listed simply as a USB input and output devices with the volume control greyed. So no way to verify Audio Midi app in System Preferences. Its only viewable in the Audio Midi app itself which was checked after step 2.

Re 4 : Other users seem to be using device with the Mac I have the latest Firmware on the device (but that does not exclude potential firmware errors) Trying to find users with identical Firmware and Mac setup to compare notes has been proving extremely difficult.

Re 5 : No joy, all I get is front desk response of read the manual no real technical support help to discuss sample rate mismatches.

So only option is to pursue with Apple, which is all new to me. I assume this forum is just users and not Apple itself? Do Apple do email support directly or only phone support?

Thanks

David