RME User Forum — usb.madi dropouts in cc mode with iphone

Re: usb.madi dropouts in cc mode with iphone

null@example.com (waedi) — Wed, 05 Aug 2026 14:29:43 +0000

Then there is a chance after an upcoming iOS upgrade the issue will hopefully be gone.

Re: usb.madi dropouts in cc mode with iphone

null@example.com (MH 3) — Wed, 05 Aug 2026 09:15:46 +0000

After a little research on the www, it seems that the iPhone 17 (pro max?) has an issue with cc.
A iPhone 16 pro from a colleague works flawlessly, as expected
Sorry for the trouble

Re: usb.madi dropouts in cc mode with iphone

null@example.com (MH 3) — Mon, 03 Aug 2026 06:50:17 +0000

MC wrote:

Anyway, there is nothing we could change or optimize here. If CC on an iPhone can not handle that data load (remember that in isochronous mode even a stereo playback will activate all 64 channels to be transmitted) then it is as it is. I will check that myself in 2 weeks.

Ok, thank you

Re: usb.madi dropouts in cc mode with iphone

null@example.com (MH 3) — Mon, 03 Aug 2026 06:48:14 +0000

waedi wrote:

What I would switch OFF all of them for a test.
While you don't use this app it is active in the background.

Everything is and was switched off

Re: usb.madi dropouts in cc mode with iphone

null@example.com (MC) — Mon, 03 Aug 2026 06:39:21 +0000

Not with Neutron. That one talks directly to the USB.MADI. It has buffer settings and status info (you need to work through the multitude of settings to find that). Default is SRC mode, set it to follow the file's sample rate (in case you did not already).

Anyway, there is nothing we could change or optimize here. If CC on an iPhone can not handle that data load (remember that in isochronous mode even a stereo playback will activate all 64 channels to be transmitted) then it is as it is. I will check that myself in 2 weeks.

Re: usb.madi dropouts in cc mode with iphone

null@example.com (waedi) — Mon, 03 Aug 2026 06:21:04 +0000

What I also would check : Apple music app, in the iPhone system preferences the Apple music app has some audio settings, streaming quality, EQ, loudness correction, etc. I would switch OFF all of them for a test.
While you don't use this app it is active in the background.

Re: usb.madi dropouts in cc mode with iphone

null@example.com (MH 3) — Mon, 03 Aug 2026 06:01:19 +0000

I tried foobar2000 too, and it makes no difference. Adjustig the buffer to the max (10000) changes the pattern a little bit, but still to much dropouts.

Re: usb.madi dropouts in cc mode with iphone

null@example.com (MH 3) — Mon, 03 Aug 2026 05:29:51 +0000

MC wrote:

Workaround: use Neutron and play a file that is in 48 kHz

I bought Newton and it is nearly the same as without.
The files play now in 48 kHz, but that doesn´t matter.

The pattern of the dropouts is a little bit different than before, but still unusable

Re: usb.madi dropouts in cc mode with iphone

null@example.com (waedi) — Mon, 03 Aug 2026 05:12:39 +0000

While the Neutron player is a bit expensive, we can use free apps Winamp or VLC media player or Foobar2000

Re: usb.madi dropouts in cc mode with iphone

null@example.com (MC) — Mon, 03 Aug 2026 02:28:39 +0000

MH 3 wrote:

MC wrote:
Is that sample rate on the iPhone intentionally? iPhones typically do not follow external sample rates, so you need to set it manually.
Where can i do that?

In an app that actively sets the sample rate. Hard to find though. Workaround: use Neutron and play a file that is in 48 kHz

Re: usb.madi dropouts in cc mode with iphone

null@example.com (waedi) — Sun, 02 Aug 2026 18:46:55 +0000

Multichannel audio DAW LogicPro exist also as version for iPad but not for iPhone.

Beside that the iPad is much more powerful.

Re: usb.madi dropouts in cc mode with iphone

null@example.com (MH 3) — Sun, 02 Aug 2026 18:01:27 +0000

My iPad works just fine (iPadOS 26.5.2).
Can someone explain whats the difference between the two devices in handling audio?

Re: usb.madi dropouts in cc mode with iphone

null@example.com (waedi) — Sun, 02 Aug 2026 13:23:36 +0000

It is supported, but how deep and how stable is not guaranteed. iPhone iOS is not made for a MADI interface, but it should be possible at least to play out a stereo music over Madi channels 1/2.
In this case I would use the adapter instead of CC-interface.

Re: usb.madi dropouts in cc mode with iphone

null@example.com (MH 3) — Sun, 02 Aug 2026 13:19:28 +0000

I don´t think it's a problem related to Wlan.
With a Generatorapp I have the same kind of dropouts and with iTunes/ music it is the same. And these tracks are on the phone an Alan is off!
The iPhone works fine with a usb c to xlr adapter.

I think it is a communication mismatch between the usb.madi and the iPhone. Maybe it simply doesn´t work and cc Mode is not supported in this case?

As said before, Spotify/ Reaper, etc. work fine in cc Mode on the MBP and there are no dropouts and the samplerate is 48 kHz

Re: usb.madi dropouts in cc mode with iphone

null@example.com (waedi) — Sun, 02 Aug 2026 10:39:46 +0000

We had also dropouts with iPhone Pausemusik because organizer prepared this music as playlist in Spotify to play as stream from the internet.
it was in the Keller of an old building in the town, no wifi, internet was not reliable there.
Your music is on the iPhone in a folder ?