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No input - any ideas

0 votes

Installed version 2.1.3 and I can now drop the input object onto the table, but there is no input from the built-in mic, just some digital noise.  I know the mic is working as I can record from it using other apps (e.g. Audio Evolution).

The other problem is that I can't figure out any way of getting a line input into the tablet - it appears there is no way to get USB audio working on Android 4.1.1, which is what I was originally hoping sad.  I tried a phone headset in the audio socket but it appears there is no mic input present there so I can't use a breakout box sad.

I reslise these are probably both problems with the tablet, and not with Reactable - just wondering if anyone has any brilliant ideas!  (Yeah, I know, buy an iPad)


related to an answer for: Mic input is disabled incorrectly
asked Jul 24, 2013 in Mobile Android by spiritvisions (130 points)

2 Answers

0 votes
Hi Martin

we tried with our Android tablets / smartphones (Samsung) and audio input worked as expected (no digital noise)

It is a bit hard to fix the problem without having access to the specific device.

A question: is it just pure noise or can you hear any of the input, even if garbled?

best regards
answered Jul 24, 2013 by bdk (720 points)
also, as you say, external Audio on Android is not supported.
You could however try installing a modified Android version such as

see this video for an example use:
 (hmm, it could be a fake...)

And regarding external USB audio on Android: https://code.google.com/p/android/issues/detail?id=24614&sort=-stars&colspec=ID%20Type%20Status%20Owner%20Summary%20Stars
Just low-level noise, none of the actual input.

The tablet I'm using is my main device at the moment so I'm not really comfortable with rooting and installing a new Android version, so don't worry about it. Just for the record, though, do you know of an Android tab with line in (or proven USB support) which you would recommend for use with Reactable ?

As far as I know (and as seen in the above un-listened feature request made to the Android dev team) external audio devices are not supported by Android.

However in case you have a tablet supporting headphones+mike jack connector (aka TRRS jack) you can try to exploit that mic input: http://www.techlife.net/smartphones/how-tos/2012/5/add-an-audio-input-to-android/

Also something like this looks interesting: http://icoast.twomini.com/wp-content/uploads/2013/05/ledhill-3-5-mm-trrs-stereo-plus-mic-full-conductor-stereo-audio-cable-y-splitter.jpg

However I believe that tablets not made to work with SIM card / 3G (like probably in your case) don't support that kind of connector / headset.
Is your mic headset input working with the other audio recording apps?

However: beware of latency! Roundtrip Input -> process -> output can be as much as 500 msecs...

If you are interested on closely following the evolution of Android audio, check out this mailing list / wiki: http://music.columbia.edu/mailman/listinfo/andraudio
for instance: http://music.columbia.edu/pipermail/andraudio/2012-April/000614.html

Anyway, we'll try to research the possible causes of "noise" input.

Yes, I was hoping the tablet might have a TRRS connector even though it's WiFi only, but no such luck... it doesn't work at all.  So.... many thanks for all your efforts, but I guess I'm going to have to upgrade to a better model with line input, or wait until USB is officially supported.  Have been playing with Reactable on its own and I can see I will be able to use it for backing - it's just I won't be able to sync delay/LFO etc. on the violin ...

Keep developin' !
0 votes
Nice share.....................
answered Jul 29, 2013 by react (140 points)