CVOsc
Music
Free · In‑App Purchases
Connect an Expert Sleepers ES-9, ES-8, or any class-compliant DC-coupled interface to your iOS Device, and visualize up to sixteen simultaneous channels of Control Voltage and audio — no laptop, no patch cables to a computer.
See your patch
• Up to 16 simultaneous channels in a paged, responsive grid
• Three display modes: All (every channel), Selected (just the channels you tag), and Overlay (selected traces superimposed on a single canvas for phase and correlation work)
• Per-channel range, offset, and time base, in volts for CV and normalized units for audio
• Auto-trigger on zero crossing for rock-steady waveforms
• Auto-fit to waveform when you just want the trace centered
• Independent CV vs Audio mode per channel, with renameable identities ("VCO 1", "LFO Slow", etc.)
Listen in
• Built-in live monitor: route any input channel to any physical output of the interface
• Monitor multiple channels simultaneously, each to its own output
• Output assignments persist across sessions
• Hot-plug aware — disconnect and reconnect, and CVOsc rebinds automatically
Pro features (auto-renewing annual subscriptions)
• Tuner — pitch detection that works on both CV pitch signals and audio. See note name and cents offset live in the pane.
• Record & Playback — capture every selected channel to its own WAV file, then play recordings back through the interface. CV recordings are routed only to DC-coupled outputs; the app warns you if you try otherwise. Live monitoring and playback share the same USB pipeline, so you can play recordings while monitoring live channels at the same time.
• Saved Channel Settings — every channel comes back exactly the way you left it on the next launch.
• Presets — save and recall whole-rig configurations: channel names, signal types, all scale settings, monitor routings — under a single name.
Each subscription is independent. Restore Purchases in Settings re-entitles anything you've previously bought on this Google account. Cancel anytime; cancellations take effect at the end of the current billing period.
Hardware requirements
CVOsc requires a class-compliant USB audio interface and a USB-C OTG cable. To visualize CV signals (not just audio), the interface must be DC-coupled. A powered USB hub is recommended for tablets that don't supply enough bus power.
Supported DC Coupled USB Sound Cards
Expert Sleepers
- ES-9 (14 ch)
- ES-8 (8 ch)
- ES-3 (8 ch)
- ES-40 (8 ch)
Solid State Logic
- SSL 2 MKII (2 ch)
- SSL 2+ MKII (4 ch)
- SSL 12 (4 ch)
- SSL 18 (10 ch)
- SSL ALPHA 8 (8 ch)
MOTU
- M2 / M4 / M6 (2 / 4 / 6 ch)
- UltraLite-mk5 (10 ch), UltraLite AVB (8 ch)
- 624 (6 ch), 8A (8 ch), 8M (8 ch), 10pre (8 ch), 16A (16 ch), 24Ao (24 ch)
- 1248 (8 ch), 828 (8 ch), 828es (8 ch), 848 (12 ch)
RME
- Fireface UCX II (6 ch)
Universal Audio
- Apollo Twin / Twin MkII / Twin X / Twin USB / Twin X USB (4 ch)
- Apollo x4 (6 ch), x6 (8 ch), x8 (10 ch), x8p (10 ch), x16 (18 ch)
Native Instruments
- Komplete Audio 6 MK2 (4 ch)
Non-DC Coupled interfaces still work for audio I/O; they just won't pass the validator's DC-coupling check for CV playback.
EULA: https://www.apple.com/legal/internet-services/itunes/dev/stdeula/
Privacy: https://cvosc.com/privacy.html
Ratings & Reviews
- This app hasn’t received enough ratings or reviews to display an overview.
Fixing a bug with square waves
The developer, Aleph Void LLC, 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 Linked to You
The following data may be collected but it is not linked to your identity:
- User Content
Accessibility
The developer has not yet indicated which accessibility features this app supports. Learn More
Information
- Seller
- Aleph Void LLC
- Size
- 5.5 MB
- Category
- Music
- Compatibility
Requires iOS 26.4 or later.
- iPhone
Requires iOS 26.4 or later. - iPad
Requires iPadOS 26.4 or later. - Mac
Requires macOS 26.4 or later.
- iPhone
- Languages
- English
- Age Rating
4+
- 4+
- In-App Purchases
Yes
- CVOsc Annual Convert To Gate $0.99
- CVOsc Preset Annual $0.99
- CVOsc Annual Recording $0.99
- CVOsc Annual Tuner $0.99
- Copyright
- © Aleph Void LLC
