DPW Design - SW3 Splice

The SW3 Splice from DPW Design is a click-free switching module that lets you cut between two signals at high speed — up to audio rate — without any audible artifacts. The trick: instead of looking for zero crossings (which two signals might never hit simultaneously), the module detects when both signals share the same voltage and switches at that precise moment. DPW has essentially combined their Z3 Zero module with half of their Switch module into one compact package, so you get wave splicing without a mess of patch cables.

There are three switching modes to choose between: hard switching for traditional clicks, zero-difference for clean transitions, and zero-difference with slope detection for the smoothest results (only switching when both signals travel in the same direction). Division settings (/2 and /4) let you slow things down for subharmonics or more organic modulation behavior. Routing covers dual mono, stereo, or mono-to-stereo, with independent division per channel for phase tricks and stereo movement.

Feed it oscillators, samplers, LFOs, drums — whatever you've got. A straightforward way to get new sounds from what's already in your rack.

Feed it oscillators, samplers, LFOs, drums — whatever you've got. Two signals in, something new out. It's an easy way to get new sounds from what's already in your rack.

Features:

• Click-free wave splicing at up to audio rate
• Three switching modes: hard, zero-difference, zero-difference with slope detection
• Division by /2 or /4 for subharmonics and organic modulation
• Dual mono, stereo, or mono-to-stereo routing
• Independent division settings per channel
• Full Z3 Zero functionality: signal sync, swing, probability skipping
• Reset inputs for beat-synced applications
• CV control over switching rate
• Handles audio, CV, or both

**NOTE: “**Wave splicing” is a synthesis technique where you rapidly switch between two audio signals at points where they share the same voltage, resulting in click-free transitions even at very high speeds. Unlike zero-crossing detection, which only works when signals pass through 0V, this approach finds matching voltage levels anywhere in the waveform — making it far more reliable for combining signals that never cross zero at the same time. In modular synthesis, wave splicing has emerged as a creative patching technique for generating new waveforms, creating hybrid timbres, and morphing between sound sources.