The S4 is a stereo granular sampler and performance instrument designed for sound explorers, experimental producers, and live performers. With a hands-on interface, rich signal chain, and deep modulation system, the S4 invites you to sculpt, mangle, and reimagine sound in real time. 4x stereo tracks with a 5-stage signal chain: - Material: Play samples from internal memory, record and overdub. Includes 8-voice polyphonic sampler with MIDI control. - Granular: Shape grains with contour, size, and pitch. Create anything from ambient clouds to glitchy textures. - Filter: 48-band resonant filter bank with classic models and morphing modes. - Colour: Dual-band distortion, bit reduction, compression, and noise. - Space: Stereo delay and reverb with freeze and multiple delay types. - 4 modulators per track: LFOs, envelopes, random, and envelope followers can modulate any parameter for dynamic, evolving patches. - Perform page with 12 macros: Map any parameters to 8 sliders and 4 punch-in FX buttons for expressive live control. - 128 scenes: Save and trigger full parameter and sample snapshots. MIDI Program Change supported. - Mixer: 4-channel stereo mixer with DJ-style filters and master compressor. USER INTERFACE: - High-resolution LCD color display, 3.5 inch - 21 tactile RGB buttons - 9 high-quality endless encoders HARDWARE: - Internal Memory:A4 GB (expandable via USB) - Audio Processing:A24-bit / 48kHz stereo - USB Audio Interface:AClass compliant, 10 in/10 out I/O: - Inputs:A2x 6.3 mm (1/4") jack - Outputs:A2x 6.3 mm (1/4") jack, 3.5 mm TRS headphone - MIDI:A3.5 mm TRS (Type A) in/out - Sync:A3.5 mm analog sync in/out - USB-C Port *** Firmware update- June 2025 *** S4 OS 2.0 delivers a complete rewrite of the engine and unlocks powerful new capabilities for performance, sound design, and live sampling. Highlights of OS 2.0 include: - Perform: Global macros and punch-in effects for expressive, hands-on control - Scene: Save and trigger snapshots of full machine states- up to 128 per project - Temp: Temporarily change any parameter during performance with instant recall - Disc: Stream long-form audio directly from the S-4's internal storage - Follow: New envelope follower for dynamic modulation - Explore malleable sound. Mold, carve, bend. **UPDATE 27/05/2026** Torso Electronics have released firmware update 2.2 for the S4, which introduces a number of new features and bug fixes, reworking the granular capabilities of the S4. - New scan parameter lets you scan through looped audio, which you can do with real-time stretching and modulation applied. - Position mode lets you manually specificy the position the buffer stars reading. You can also use it with a syncable delay mode. - Pitch randomisation mode in both stereo and mono modes - Reverse playback - Feedback reworked - Feed output back into the buffer - Expanded movement with grains - Warp is now part of Spray - Mosaic can run independently of playback