TR4 — Four Track Tape Recorder
A tape machine for your pocket
Free · In‑App Purchases · Designed for iPad. Not verified for macOS.
Press play on your gear and the tape rolls. TR4 records any class-compliant USB device by itself, from an EP-133 K.O. II to a synth or drum machine. No computer.
TR4 is a four-track tape recorder and editor, built like an instrument.
A giant disc with real physics sits at the center. Drag it to scrub with varispeed, even in reverse. Flick it and it spins down like real hardware. One rotation is two seconds of tape.
On iPad, TR4 runs in landscape: the four tracks and their waveforms on one page, volume, pan, mute, solo and delete in each track row, and the same disc in the transport.
MADE FOR HARDWARE
Plug in any class-compliant USB audio device — such as the EP-133 K.O. II — and TR4 recognizes it by name, captures true stereo at 48 kHz, and arms itself. Press play on your groovebox and recording starts on the exact downbeat — from the MIDI signal if your device sends one, from the first sound if it doesn't. Stop the groove: the take ends, rewinds to zero and re-arms for the next pass. With a multichannel interface, all four tracks arm and record at once.
MIDI
• Follows MIDI transport — start, stop and continue, from any device that sends it
• MIDI Learn — map play, stop and record to a pad, a key or a footswitch
• Live monitor — see exactly what your gear is sending
RECORD
• Four tracks with overdub — record one while the others play
• 20 minutes per tape
• Built-in mic, headset, Bluetooth or USB stereo input
• Auto-record on USB signal, with noise calibration
• Metronome with 3-2-1 count-in and a visual beat that never leaks into the mic
• Auto-save: every take is kept as raw audio plus edits
EDIT
• Per-track volume, pan, mute and solo
• Non-destructive crop with draggable handles
• Loop playback while you fine-tune
MAKE IT YOURS
• Hold the disc to swap its look — a full collection of designs, from vinyl to street art
EXPORT
• Mix or separate stems, straight to the share sheet
• M4A included free; WAV & AIFF with TR4 Pro
TR4 PRO — ONE-TIME PURCHASE
Unlock everything, once: WAV & AIFF export, separate stems, unlimited projects, all disc skins and voice transcription. No subscription.
No accounts. No ads. No tracking. Your recordings stay on your device. Transcription uses Apple's speech recognition, on device whenever your language supports it.
TR4 now works in portrait on iPad.
• A layout built for the taller screen: the four tracks and their waveforms sit above a module in two rows, with the clock, metronome/input label, VU meter and disc on top and the transport below.
• Rotate whenever you like. The layout follows the iPad in both orientations.
• The iOS status bar is hidden on iPad, and the timeline is taller in portrait, with more room for the finger.
Fixed
• With the metronome on, RECORD waits for a 3-2-1 count-in before it starts. On iPad that count was invisible, so the button looked unresponsive for a few seconds. The countdown now shows on screen, as it does on iPhone.
The developer, Jonattas Poltronieri, 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.
Accessibility
The developer has not yet indicated which accessibility features this app supports. Learn More
Information
- Seller
- Jonattas Poltronieri
- Size
- 7 MB
- Category
- Music
- Compatibility
Requires iOS 18.0 or later.
- iPhone
Requires iOS 18.0 or later. - iPad
Requires iPadOS 18.0 or later. - Mac
Requires macOS 15.0 or later and a Mac with Apple M1 chip or later. - Apple Vision
Requires visionOS 2.0 or later.
- iPhone
- Languages
- English
- Age Rating
4+
- 4+
- In-App Purchases
Yes
- TR4 Pro $7.99
- Copyright
- © 2026 Jonattas Poltronieri
