Hello,

I'm having trouble getting any kind of audio input signal to the AudioInjector Octo.

I have been able to get all 8 channels of audio output working just fine. I've been primarily using PureData, and I have been able to output .wav files and test sine wave patterns to each of the 8 channels independently and simultaneously.

However, I have not been able to see any audio data at all on the input side. PureData has a diagnostic tool to help with this type of troubleshooting (Media -> Test Audio and MIDI...) but the only data I'm seeing are zeroes.

For input, I have been using a set of cheap microphones I bought off Amazon that use a 3.5mm jack. I've confirmed that they are working by using them to record audio on my laptop via the Headphone/Mic combo jack. I thought that maybe these microphones need a preamplifier to work with the AudioInjector in order to get to line level. But, I have also tried routing the AudioInjector output back to the input, and still get nothing but zeros.

This has me thinking that I must be doing something wrong from a software or configuration standpoint.
-I have opened up the AlsaMixer and confirmed that all ADC channels are not muted and do not have the volume turned all the way down.
-I've verified that my /etc/asound.conf and ~/.asoundrc both match the guidance listed in the readme at https://github.com/Audio-Injector/Octo
-I've checked aplay -l and arecord -l, they both list the audioinjectoroc as a device.

What other steps can I take to get audio inputs working on the Octo? Any help would be greatly appreciated!

-Chris

Chris Fernandez

518-242-6475

Hardline, Inc.

112 South Park Street

San Francisco, CA 94107