Kilohearts Multipass

Multipass takes a deceptively simple idea and executes it with real polish. It splits your audio into as many as five frequency ranges, then lets you build a completely independent effect chain inside each one. What makes this more than a glorified multiband compressor is the engine underneath: every processor is a Kilohearts Snapin, a modular building block you drag, stack, and reorder freely. Distort the lows, add shimmer to the highs, gate the mids, and modulate any parameter with envelopes, LFOs, or randomization. It excels at surgical, frequency-conscious sound design that would be awkward or impossible in a conventional effects rack.

The strongest argument for Multipass is its workflow. Band splitting is visual and immediate, the routing stays legible even when chains get dense, and the modulation system turns static processing into something alive. Multipass ships with Kilohearts Essentials, a set of thirty free Snapins covering the basics, so it functions out of the box. Apple Silicon support is native and updates are free for life, which reflects Kilohearts' long-term commitment.

The honest trade-off is the ecosystem. Multipass is at its best when you own the wider Snapins catalog through Professional or Ultimate; lean on Essentials alone and you feel the ceiling. The modular concept also carries a learning curve, and at $99 it is expensive if all you actually need is straightforward multiband dynamics.

Against its peers it stakes out clear territory. It is far more flexible than the parallel-aggressor approach to multiband saturation, and it serves a completely different purpose than a reverb like raum or a monitoring tool like reference — those solve single problems, while Multipass is a modular canvas. Choose it if you crave deep, modulated, per-band processing and are ready to grow into the Snapin world. A ten-day trial lets you test the workflow before you commit.