iPad Screenshots


MonoStereo Synthesizer is a free full-featured analog mono synth with oscillator panning.

App Store Reviews:
***** "This is the finest synth in its class. It has great presets and something a little extra special on it. It cuts. It's simple. And it sounds fantastic!"
***** "Great sound and interface!"
***** "So great! I have already spent hours with this little gem. A three oscillator dream."

The synth is completely free with no in-apps. If you feel the need to pay something for it, go see a gig by a local band! If that doesn't cover it, buy their t-shirt! (or their CD if you have one of those CD-players we used to have 3 years ago)

* Minimalistic size, fast loading time and CoreMIDI Support!
* Audiobus and Inter-App Audio support
* 3 Oscillators with customisable waveform (sine, square, saw), phase, level, detune and pan
* Lowpass and Highpass filters
* 2 LFO's with customisable targets from filter values to oscillator panning and detune
* Filter and Amp Envelopes
* Portamento (almost named that 'Glide' but came to my senses. Portamento is portamento!)
* Delay and Chorus effects (very basic, I know)
* A few presets
* Saving and loading your own sounds
* Virtual keyboard

If you end up using this synth for production or live performances, I would be happy to hear from you!
You can drop me an e-mail to jantunen.juho (a) gmail.com

I have a long todo-list for the (possible) updates but I'm open to feature suggestions and ideas!

What’s New

Version 1.2

This app has been updated by Apple to use the latest Apple signing certificate.

* Audiobus and Inter-App Audio support! Woohoo!
* Performance optimizing

Ratings and Reviews

4.7 out of 5
6 Ratings

6 Ratings

kashleeee ,

Pretty cool

This app is a good start to the creation of many cool sounds. I do wish the preset sound choices weren't so few, which means that I'll have to roll up my sleeves and start creating sounds myself. But isn't that what this is all about? Cool early 80's sounds

dgc7strings ,

Latency issues

I downloaded the app with high hopes. Alas, it has severe latency problems. Almost a 1 second delay from the time you press a key before the keyboard responds. Unusable for live work. Even studio work will be difficult since you can't play in time with a source.
The filters and oscillators seem very well done. Lots of cool sounds can be had. When latency get fixed, this could be killer....
Good work so far, dev. Keep it up!

littlewoodg ,

Thanks, this is a great update

Woo hoo is right, great to now be able to integrate this with sequencers and daw on the device. Big sound.
No latency issues here


Juho Jantunen
4.8 MB

Requires iOS 7.0 or later. Compatible with iPad.



Age Rating


  • Family Sharing

    With Family Sharing set up, up to six family members can use this app.

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