Voice Stack Mix

A 16-slot level, pan, enable, and solo mixer indexed by the current voice-stack position.

What it does #

Voice Stack Mix gives each stacked voice its own mix settings while using one module in the shared Grid patch. The current stack index chooses one of up to 16 Level, Pan, enable, and Solo entries, so a single sound can become a balanced stereo unison or a deliberately uneven ensemble.

Controls and ports #

Each displayed stack slot provides Level, Pan, speaker-shaped enable, and Solo settings. In receives the current stacked voice, the hidden stack index selects its slot, and Out carries that voice after its per-stack settings.

Practical uses #

• Spread stacked oscillator voices across stereo and trim their levels into a controlled unison sound.
• Solo individual stack positions while tuning pitch, phase, timbre, or cross-modulation relationships.
• Create asymmetric ensembles by making outer stack voices quieter or placing selected voices at specific pan positions.

Things to know #

• The recovered arrays support 16 stack indices, even when the active stack count is smaller.
• If any stack position is soloed, enabled but non-soloed positions are suppressed.
• Unlike the regular Mixer body, the recovered Voice Stack Mix body does not contain a 10 ms enable/solo ramp.
• It uses the same hybrid quadratic pan law as Pan and Mixer.
• The module processes the current stacked voice; it is not a conventional six-cable summing mixer.

Technical details #

A high-confidence Nitro implementation candidate supports the technical summary, but the visible-module mapping remains inferred.

The exact grid/mix/voice_stack_mixer body owns 16-element Level, Pan, Enable, and Solo arrays. stack_index selects the current entries. A voice is audible when its own Solo is on, or when Enable is on and no Solo exists anywhere in the array. For audible voices it computes p=<1-pan,1+pan>, applies panHybrid(p)=p*(1.18-0.18*p), multiplies by the selected Level, and passes the result. Disabled voices output zero. A separate LED signal reflects current per-stack activity.

Nitro port	Type
stack_index	InputValuePortType
in	InputAudioPortType
level	InputAudioPortType
pan	InputAudioPortType
enable	InputValuePortType
solo	InputValuePortType
out	OutputAudioPortType
LED	OutputAudioPortType

Open questions #

• Measure the visible stack-count interaction, defaults, level and pan ranges, and whether the UI applies smoothing outside Nitro.
• Test solo/enable changes on sustained audio, inactive array slots, stack-count automation, and voice reallocation.
• Verify the LED aggregation, overload behavior, and exact relationship between stack index and the displayed slot order.

Version and sources #

Checked against Bitwig Studio 6.0.6. This page combines Bitwig's module metadata, the existing Grid course and guides, and Nitro analysis where the mapping is strong enough to support a technical statement.

Related material #

• Grid Modules course reference
• Bitwig Polyphony and Voice Stacking Explained in Detail
• Cross-Modulation Voices in Bitwig

Return to Bitwig Grid Modules or the Grid Modules course lesson.