# CV Mod — LFO and Oscillator CV Module > Modular synth LFO and VCO module for iOS devices. (iPhone/iPad app by Steven Connelly.) - Source: https://appshunter.io/ios/app/cv-mod/id1406207229 (this page in markdown: same URL + `.md`) - Developer: [Steven Connelly](https://appshunter.io/developer/1049373664) - Category: Music, Education - Price: $1.99 - Rating: 4.00/5 from 8 App Store ratings · 5 written reviews indexed - Age rating: 4+ - Requires: iOS 11.0 · 19 MB - Languages: American English - Released: 2018-07-29 - Data updated: 2026-08-08 - Monetization: paid - User reviews in markdown: https://appshunter.io/ios/app/cv-mod/id1406207229/reviews.md ## What is CV Mod? CV Mod is a 2 LFO/VCO Oscillator Module meant to be used with modular or semi-modular synth hardware. Simply connect the headphone output of your iPhone or iPad to one or more CV or audio inputs on your hardware. To get the most out of this module, use a stereo breakout cable to separate the left and right audio channels. Just like that, you now have 2 additional LFOs or full range oscillators added to your rig! CV Mod can also send out signals via a connected DC-coupled audio interface. With Audiobus 3 and Inter-app audio support, you'll have an easier time routing CV Mod's outputs to wherever you need them to go. In the spirit of modular synthesis, you have complete control over each oscillator’s parameters via external MIDI. You can also modulate one oscillator’s frequency and phase with the other oscillator’s rate and depth controls. With two drawable wave table editors, you can create whatever crazy wave forms you like, unleashing a vast sea of possibilities. Instant grit! Intuitive controls via the main faders, XY pad, or MIDI CC make this an incredibly easy way to add more modulation and sound sources to your gear. Download now and have some good old-yet-new-fashioned creative fun! Key Features: 2 Oscillators that function as LFOs or sound sources with 5 frequency ranges: 1 Hz, 4 Hz, 40 Hz, 120 Hz, and VCO mode (full range). This wide set of ranges allows for ultra slow ambient filter sweeps and rip roaring ring-mod madness Choose from 8 different waveforms: Sine, Triangle, Sawtooth, Reverse Sawtooth, Square, Random, and two user defined shapes Wave Table grid editor allows you to draw 2 custom waveforms Each oscillator has its own envelope generator, which can be synchronized to subdivisions of the current tempo or the rate of one of the oscillators Multi-touch control of each oscillator’s rate, depth, and phase with easy to use faders Fine tuning control of each oscillator, + or - one octave Separate glide controls for each oscillator, with a configurable maximum glide time of 120 seconds! MIDI Keyboard control of an oscillator’s frequency allows you to play notes and use this app as an additional sound source in VCO mode Duophonic mode allows you to play two notes at once when both oscillators are controlled by MIDI keyboard in VCO mode XY Pad allows you to control up to 3 parameters, with the Z-axis mapped to touch pressure (if your device supports it) Tempo Sync feature that constrains each oscillator’s rate to subdivisions of the current tempo, when operating in one of the LFO modes Rich MIDI implementation allows you to control all oscillator settings via MIDI CC with MIDI learn. In addition, you can control each oscillator’s rate and the overall depth via pitch wheel, mod wheel, velocity, aftertouch, and note values (key tracking) Cross modulation capabilities allow you to modulate one oscillator’s phase and frequency with the rate and depth of the other oscillator Turn either oscillator into a trigger pulse, which can be synchronized to subdivisions of the current tempo or the rate of the other oscillator Ability to save presets and wave tables Other settings include: Tempo override from external MIDI clock or via Ableton Link Ableton Link integration Pitch bender range control (maximum of 2 octaves) Background audio mode Oscillator pan controls: each oscillator can be panned to the left channel, right channel, or center Aftertouch sensitivity control (allows you to take it easy on those older keybeds) Bit depth resolution reduction controls for each oscillator, which opens up even more possibilities ## Key features - 2 LFO/VCO oscillators - Custom drawable waveforms - MIDI CC control - Tempo sync - Envelope generators - XY pad control ## Recent user reviews (5 of 5) All indexed reviews: https://appshunter.io/ios/app/cv-mod/id1406207229/reviews.md ### 1/5 — No way to contact the developer *2021-09-12* This app is broken. The link for app support links to his blog but there’s no obvious way to contact them from there. **Developer response:** Hi there. My contact info is in the user guide. (Settings icon -> “Guide”) Please email me at eokuwwy (at) gmail (dot) com and let me know what the issue is. I’ll be more than happy to fix it! Thanks. ### 4/5 — Great, but *2021-07-23* Great app but I’m not able to use this with an audio interface plugged in and it only seems to work with the headphone jack. I would love to see support for DC coupled external audio interfaces like the ES-9 added. If you’re okay with just the headphone jack support, buy this immediately. **Developer response:** Hey, thanks for the feedback! Several months ago I found a way using AUM. On a new audio strip, I inserted CV Mod as an inter app audio app (inserting as an audiobus app works too) and then I set the outputs of that channel strip to outputs 5 and 6 on my PreSonus interface, which is a DC-coupled USB audio interface, though it requires an external power adapter. Doing that allows a range of up to 5 volts out of the audio interface outputs. There might be cheaper apps that let you route audiobus or IAA apps to specific outputs. But AUM worked for me. Would be nice if you could choose outputs right in the app though :) I made a video on my YT channel about it. “thesrabbit” is my channel name. The vid is the one about Audiobus and IAA support. I hope that helps. Feel free to email me if that doesn’t work. Cheers ### 5/5 — Great utility app *2020-09-15* Future feature request: EG direct output, not just as a mod source to LFOs ### 4/5 — Great cv app *2020-04-04* This is great; just a wee bit confusing... once you get it it’s ace! ### 5/5 — A genius app!!! *2019-04-17* This app is absolutely amazing and works so well with my moogfooger!! Love it!! ## Frequently asked questions about CV Mod ### What is CV Mod? CV Mod is a music application that functions as a 2 LFO/VCO oscillator module for modular and semi-modular synth hardware. It allows users to generate LFOs and sound sources by connecting their iPhone or iPad's headphone output to their synth rig. ### How do I connect CV Mod to my synth? You can connect CV Mod to your synth hardware by plugging your iPhone or iPad's headphone output into the CV or audio inputs of your modular or semi-modular system. Using a stereo breakout cable is recommended to utilize both oscillators. ### Can I create my own waveforms with CV Mod? Yes, CV Mod features two drawable wave table editors, allowing you to create custom waveforms. This offers a vast range of possibilities for unique sound design and sonic textures. ### Does CV Mod support MIDI control? Yes, CV Mod offers extensive MIDI implementation. You can control all oscillator parameters via MIDI CC with MIDI learn, and modulate frequency and phase with other oscillator controls. It also supports MIDI keyboard control for playing notes in VCO mode. ### What are the frequency ranges for the oscillators? The oscillators in CV Mod have five frequency ranges: 1 Hz, 4 Hz, 40 Hz, 120 Hz, and VCO mode (full range). This allows for a wide spectrum of applications, from slow LFO sweeps to full-range sound generation. ### What is the price of CV Mod? CV Mod is a paid application, priced at $1.99. This one-time purchase grants access to all its features for expanding your modular synth setup. ### Is CV Mod suitable for beginners? CV Mod is designed with intuitive controls via faders, an XY pad, and MIDI CC, making it easy to add modulation and sound sources to your gear. Its clear features and direct connection method aim to be accessible for those exploring modular synthesis. ### What devices does CV Mod support? CV Mod is supported on iPhone, iPad, and iPod devices. It is rated for ages 4 and up, making it accessible for a wide range of users. ## Version history (last 5 releases) ### 1.5.3 — 2021-10-02 iOS 14+ Ableton Link network compatibility fix ### 1.5.2 — 2020-12-30 - Receive start/stop messages from Ableton Link - Replaced MIDI connections list with a single, stable MIDI input (multi-device MIDI support wasn't working right anyway!) - Duophonic mode EG fix (release was being fired on the second key press) - Drag up or down on the tempo field in the settings to quickly change the tempo - Mac M1 compatibility fixes ### 1.5.1 — 2020-12-28 - Fixed pulse stuttering during tempo changes when oscillators are in trig and sync modes - Mac M1 compatibility fix ### 1.5.0 — 2020-12-08 Audiobus 3 and Inter-app audio support (finally) ### 1.4.0 — 2020-11-11 - New MIDI connections view makes it easy to manage connections for available apps and devices - Fixed Ableton Link tempo rounding issue - Fixed incoming MIDI clock sync - Fixed sync issue when using both oscillators as a trigger pulse - Oscillators can be started and stopped via MIDI transport commands (choose "TP" in the MIDI connections view to enable) ## More apps by Steven Connelly - [MvsM Hockey](https://appshunter.io/ios/app/mvsm-hockey/id1125783252) - [MIDI Mod](https://appshunter.io/ios/app/midi-mod/id1465677026) All apps by Steven Connelly: https://appshunter.io/developer/1049373664 --- *Data collected daily from the US App Store and indexed by [AppsHunter](https://appshunter.io/). User reviews are verbatim App Store reviews. Ratings, prices and chart positions refresh continuously; this snapshot is from 2026-08-08.*