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brlmat 3rd January 2013 08:46 PM

Using tablet as a signal processor
Hello everyone!

I am trying to build an audio amplifier and i wanted to add some sound effects to my microphone and guitar input and i though of using a tablet. As the input is all mono (both from the microphone and from the guitar) it would be a pretty simple job of connecting the microphone through a buffer to the microphone input of the tablet's jack. Another input for the tablet could be the internal microphone, hardwired.

What i actually want is to have an app which can add some kind of effects to the sound, like echo, reverb, tremolo etc. in real time. Something like taking the output from the microphone, feeding it into the tablet, adding some kind of effect and than feeding it to the amplifier through the tablet's headphone output, all of this real time, no delays (or small at least).

Is it possible? If yes, how?

theAnonymous1 3rd January 2013 08:56 PM

I don't know if there is any polished app for android that would get the job done. These types of thing are still mostly in beta stages on that platform.

Your best bet would probably be to get an iPod touch and an AmpliTube iRig device. It's very low latency as it's meant for live musical instrument playback. I believe the app has most of, if not all of, the effects you mentioned.

brlmat 3rd January 2013 09:01 PM

I though of that but unfortunately an iPod touch is pretty expensive and i am not sure i can afford that + i don't think i could use both the microphone and the guitar at the same time. An android tablet is pretty cheap (i can get one for around 30-40-50 dollars, used of course). I'll take another look on the iPod touch.

LE: I just checked out the iRig. I sincerely think it is extremely overpriced. It can't be anything other than the output of the guitar connected to the microphone input of the iPod through a resistor of some value. The output is actually the stereo output of the jack. I am not sure of the app though... It could be worth something.

theAnonymous1 3rd January 2013 09:33 PM

You can get the iRig for $10 shipped if you look around. It's a heavily "copied" device. I bought one for a friend and took it apart just to see what was inside. I don't actually remeber at this point, but I think it had an active IC in it (or maybe just a FET or two?).

If it's something you're interested in let me know. My daughters birthday is soon and I was going to get her a new touch since 8gb doesn't seem to be enough storage for her. I would be willing to give a very fair price on it. I could also aquire the iRig for you if need be.

The microphone issue is a small one and could be adressed rather easily I think. Not worth throwing the baby out with the bath water at least.

t9crepair 3rd January 2013 09:36 PM

I saw an app publisher on the Play Store named Githara Effects that has a Delay app. There's NI Guitar Rig for Android for $10. Since the apps are there, there must also be interfaces available somewhere. Good luck in you search and let us know what you find.

brlmat 3rd January 2013 09:50 PM

I understand and I want to thank you for the offer. The actual problem is the transport. You see, I am from Romania and the transport would cost pretty much. Plus, by no means I want to insult you or someone else for that matter, but after some bad experiences I've had, I am not sure if I should trust anyone selling secondhand electronics on the internet, especially if not living in the same country as i do.

The ic you are talking about must be powered by the phantom power used for the condenser microphone, but the power is so little it must function as a buffer (at most) if not as a simple opamp with a gain of .3 to .5. I can make an iRig myself for that matter.

Anyway, I do not quite like iPods because of their quality. I do not find any Apple product for that matter to be of very good quality, sound or build-wise. The only iDevice I find ok is the iPod video, the iPod classic 5.5gen. It's the best sounding player i've ever heard (of course, iModed and rockboxed).

I'm out for tonight, I'll check again in the morning. I hope we can pull it off and find a way to do it on an android tablet. Have a good night!

theAnonymous1 3rd January 2013 09:54 PM


Originally Posted by t9crepair (
I saw an app publisher on the Play Store named Githara Effects that has a Delay app. There's NI Guitar Rig for Android for $10...

Cool.... thanks for that. Didn't think there was anything similar to iRig for android yet.

theAnonymous1 3rd January 2013 09:56 PM


Originally Posted by brlmat (
I understand and I want to thank you for the offer.

No problem at all. I just get overeager to help sometimes. ;)

brlmat 3rd January 2013 10:03 PM

Oh, t9crepair, I only saw your post now. I checked out the app and from the description it should be preety cool. Thanks for posting.
What about the actual real microphone? Is there some kind of an app?

t9crepair 3rd January 2013 11:55 PM


Originally Posted by brlmat (
What about the actual real microphone? Is there some kind of an app?

Like a preamp? I don't know. I did see an EQ there with ability to addon for reverb & bass boost.

I must retract my info about NI Guitar Rig...turns out it's just a video instruction thing, NOT the app.

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