Portacapture X8 and iPhone FS MISMATCH Troubleshooting

AltTuning

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Joined
Oct 22, 2021
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From
Colorado, USA
Gear owned
iXR, Model 12, X8
Have any of you had luck using the Portacapture X8 reliably as an audio interface with an iPhone? Specifically, I'm using it to mix the built-in stereo mics, an SM58 for vocals, and a 1/4" from an instrument pickup. Adding a touch of reverb to the main mix, then recording a performance video on the iPhone in the default Apple camera app. On the PC X8, I've tried 48kHz/24bit and 48kHz/32bit settings and recording simultaneously to the SD card in the X8. On the iPhone, it's either 1080p/30fps or 4k/32fps, and there are no audio-specific settings.

If I have the camera app open, on video mode, and plug in the X8 I just need to say "No" to the 1.5A question, and it seems to work reliably -- the audio is also great, much, much better than the phone mic. Problem is, every once in a while I'll do something and get the dreaded FS MISMATCH message. After that, no audio is passed between the X8 and the iPhone and I end up with videos with no audio at all. I could edit the video and mix in the audio from the X8, but that significantly slows down workflow -- good to have that option for sure, but not for this particular project.

The best I can figure is that that iPhone is switching sample rates when I change apps or go to the home screen. If I move out of the camera app and go to photos, for example, that can often trigger the FS MISMATCH error on the TASCAM. Unfortunately, when I go back to the camera app and record another video, it doesn't reset and I get no audio. Unplugging and replugging the USB cable is the only way I've found to get it to work again.

One challenge is knowing if it's working or not -- I might try a different camera app that has an audio level indicator.

Any ideas on what else I could do differently?

Thanks!
Alan
 

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