Which interface can record your stereo synths?
Audio Guru / Connections · September 12, 2026
A stereo synth needs two line inputs; count how many instruments must stay connected at once.
Why these? These interfaces record stereo line sources, but differ in how many synths fit today and whether you can add inputs later.
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Focusrite Scarlett 2i2 4th Gen
Choose if you want one stereo synthAn analog-to-digital USB interface known for simple recording: one stereo synth uses both inputs, with separate gain knobs for left and right.
- Quick initial setup
- Clear recordings
- Useful hands-on gain knobs
- Only two simultaneous inputs
- Shared microphone phantom power
- Bundled software takes setup
Focusrite Scarlett 4i4 4th Gen
Choose if you want two stereo synthsAn analog-to-digital USB interface known for flexible routing: four line-capable inputs accommodate two stereo synths, though the rear pair has fixed gain.
- Four outputs for routing
- Helpful automatic gain
- Less cable swapping
- Rear inputs lack gain knobs
- Monitoring needs control software
- Some Windows dropout reports
Focusrite Clarett+ 2Pre
Choose if you want ADAT expansion laterAn analog-to-digital USB interface known for ADAT expansion: start with one stereo synth, then add an external converter when your setup grows.
- Quiet recording path
- Solid metal housing
- Flexible output routing
- Limited gain for quiet mics
- Output knob can feel abrupt
- Clock changes need software
| Interface | Stereo synths at once | DIN MIDI | Analog line outputs | Extra input option |
|---|---|---|---|---|
| Scarlett 2i2 (4th Gen) | 1 | No | 2 | None |
| Scarlett 4i4 (4th Gen) | 2 | In / out | 4 | None |
| Clarett+ 2Pre | 1 before expansion | In / out | 4 | 8 ADAT channels at 44.1/48kHz |
Use line mode for synth outputs; XLR and jack sockets on the 2i2 share two channels, so four sockets do not mean four inputs.
Sources & image credits
Focusrite Scarlett 2i2 4th Gen specifications · Manufacturer press images
Focusrite Scarlett 4i4 4th Gen specifications · Manufacturer press images
Focusrite Clarett+ 2Pre specifications · Manufacturer press images
Pros and cons summarize selected owner reports, not our own testing or a consensus; some comments concern older software versions or particular computer setups.
