sumFX 4+

Modular Multi-FX Processor

OSC Audio

Designed for iPad

    • 4.4 • 8 Ratings
    • $4.99



sumFX is a modular multi-FX processor for Mac/PC and now iOS. Designed with simplicity in mind, to help keep you focused on the music and the sum of your efforts.

Packed with 8 high quality FX modules and an available 8 slots, each loaded with Wet/Dry control, Global Dry/Wet, and 2 (5-Mode) LFOs per slot, creating new unique sounds is quick and easy.

50 cross-platform slot & chain presets are included to get you to any sound you need quickly and we’ve packed in an easy to use pre/post waveform view to help keep you focused on the result of your FX.

SyncDynamics - Multimode dynamic FX with BPM sync attack/release (Noise Gate, Expander, Compressor, Limiter)
stereoFilter - Stereo filter with link or individual channel controls (LPF12, HPF12, BPF12, LPF24, HPF24, BPF24, Notch, & Formant options).
variMod - Multimode modulation FX with stereo offset (Chorus, Flanger,  Vibrato, Phaser, Tremolo,  & Auto Pan)
EQuator - Full high quality EQ module (3 Parametric Bands, High/Low Shelf, & HPF/LPF).
frostReverb - Stereo Algorithmic Reverb with freeze control. 
bucketDelay - Stereo Digital Delay with individual channel control.
variPitch - Stereo Pitch Shifter with 3X Modes (Doubler, Harmonizer, & Full Control)
powerPhase - Multimode Saturation, Utility Gain In/Out, Mono Maker, Channel msDelay, & Phase inverter.

What’s New

Version 1.0.7

-New preset load drop down lists for Slot and Chain
-New preset load drop down lists for Slot and Chain
-New preset save added next to save as for Slot and Chain
-New preset next/previous for Slot and Chain
-New tutorial on first launch
-New Link control for Input/Output gain inside powerPhase (Utility)
-New iPhone (only) view selections for LFO, FX, or FULL view for easier usability
-Refactored LFO/Mode sections for easier selections & more efficient CPU -
-Warning added to LFO/Mode to remind users when FX OFF
-Corrected missing check boxes in Audio Setup (Stand alone only)
-Corrected Delay reaction when Link engaged/disabled
-General reliability improvements

Ratings and Reviews

4.4 out of 5
8 Ratings

8 Ratings

Project: Punk Mayhem (Farabi) ,

Read description!

I’m editing the previous review, actually I don’t think I need the manual anymore, it’s just a couple of pages of description that’s it, just realised, it’s the sound that matters, doesn’t matter what or where it’s inspired from, from a very pragmatist point of view.

So, here comes the new king of the iOS,
All hail the the king!
The king has arrived!
All hail the king!

With love and lots of respect and hugs,
welcome, Sire!

This was the previous review, please kindly ignore this to save up your precious time brother

“I know you’ve been working hard, with passion and sincerity, but the thing I want to point out, or a question to ask. What is the purpose for the manual you’ve come up with, even with putting my all biases on your side, the manual doesn’t have any real information regarding the app, what kind of modules , their emulation background, at the very least the hardware inspiration behind the emulations, I mean I could go on. This manual is going to have a great impact on your reputation. Please, my friend, don’t take this personally, consider this a friend who truly cares about another friend of his, and suggest him to only help him. He who always praises you, beware of them. Only true friends will tell your lacking to you, no other entity will do that. With kind regards. Giving 5 stars , just to show respect for the hard work, and artistic creativity you’ve put into this bomb of an app.”

Developer Response ,

Thank you for your kind words and 5-star review. Constructive criticism is never taken negatively and your words are not taken lightly. I want to make sure users get the best experience and I'll be updating the user manual asap to make sure I get all the details I can added.

If there are any topics you want covered specifically, let us know. Feel free to reach back out here or via our contact email. We greatly appreciate user feedback and we look forward to getting you what you need to create without restriction.

Thanks again for your feedback and support! Stay tuned for the next update. We'll have some news soon.

hyperfocusmusic ,

Thanks for updating

Now it is great. Thanks for doing the updates.\ and responding. Now can use it in a way that is doable since there are loaded presets. Tried changing to 5 stars hope it worked.

Developer Response ,

Edit: The update is live! :) Thanks for your patience. My BETA team caught a really tricky last minute issue that’s been fixed.

Thanks for your review, I appreciate your time and support.

I can confirm, you've heard right! The preset use in app is getting a whole redesign in the next update. I've worked with some really helpful users to make sure it's a quick and easy to navigate. I'm not sure if Apple allows links to video example, but here is an unlisted (early) sneak peek of the preset manager.

This update is planned for next week, it's almost complete. It's in testing now and getting the final cherries on top.

Don't hesitate to let us know what else you'd like to see in the update. Below is our direct contact link.

In the meantime, I've made a quick video to help make the current system as useful and easy as possible. Link below (hopefully Apple lets it through).

Thanks again for your support!

mikenoface ,

Ehhhhh - needs improvement

Sound quality is alright. The UI seems to suffer some lag from when you move the knobs to actually hearing the change. I feel like I can get most of these sounds in higher quality from other plugins, but it could be useful if they add some more algorithms, better reverbs, etc.

Developer Response ,

Thanks for your feedback, we appreciate your support and we're sorry to hear of your troubles.

We'll be adding a lot more to come in future updates. If you experience any issues, please be sure to report your device information to our team for full investigation.

Below is our support link.

App Privacy

The developer, OSC Audio, indicated that the app’s privacy practices may include handling of data as described below. For more information, see the developer’s privacy policy.

Data Not Collected

The developer does not collect any data from this app.

Privacy practices may vary, for example, based on the features you use or your age. Learn More


  • Family Sharing

    Up to six family members can use this app with Family Sharing enabled.

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