Purpose

MIDI Filter passes or blocks MIDI events based on configurable predicates. Use it to isolate notes from CCs, split a keyboard into zones by note range, restrict to a single MIDI channel, filter out low-velocity ghost notes, or separate events from different controllers when using an all-devices MIDI Capture.

Use

Place MIDI Filter after MIDI Capture. Set the predicates to pass the events you want. Use two MIDI Filter instances with different note ranges to split a keyboard into zones. Wire the filtered output into MIDI Note, MIDI Learn, or another filter.

Inputs and outputs

• Input 0: events — midi_event_v1 (required). The MIDI event stream to filter.
• Output 0: out — midi_event_v1. Matching events pass through; non-matching events are zeroed to preserve frame alignment.

Controls

• Channel — MIDI channel filter. -1 passes all channels; 0-15 passes only that channel. System messages bypass this filter.
• Device — Device index filter. -1 passes all devices; 0+ passes only events from that device index. Lets one all-devices Capture be split per controller downstream.
• Typenote / Typecc / Typeat / Typebend / Typeclock / Typeother — Toggle which message types pass. All on by default.
• Notelow / Notehigh — Note range filter (0-127). Only applies to note on/off events. Default 0-127 (full range).
• Cclow / Cchigh — CC number range filter (0-127). Only applies to CC events. Default 0-127.
• Velthresh — Minimum velocity for note-on events. Events below this velocity are dropped. Default 0.
• Invert — Inverts the filter decision: everything that would pass is blocked, and everything that would be blocked passes.

Notes

• Zeroed (blocked) rows preserve frame alignment so downstream timing remains correct.
• Reveal channels report per-block and cumulative passed/blocked counts.

Ports

Inputs

• events row required
  midi_event_v1

Outputs

• out row
  midi_event_v1

Parameters

Channel (Channel) Int op('midi_filter').par.Channel

Default:

-1

Range:

-1 to 15

Device (Device) Int op('midi_filter').par.Device

Default:

-1

Range:

-1 to 127

Typenote (Typenote) Toggle op('midi_filter').par.Typenote

Default:

On

Options:

Off, On

Typecc (Typecc) Toggle op('midi_filter').par.Typecc

Default:

On

Options:

Off, On

Typeat (Typeat) Toggle op('midi_filter').par.Typeat

Default:

On

Options:

Off, On

Typebend (Typebend) Toggle op('midi_filter').par.Typebend

Default:

On

Options:

Off, On

Typeclock (Typeclock) Toggle op('midi_filter').par.Typeclock

Default:

On

Options:

Off, On

Typeother (Typeother) Toggle op('midi_filter').par.Typeother

Default:

On

Options:

Off, On

Notelow (Notelow) Int op('midi_filter').par.Notelow

Default:

0

Range:

0 to 127

Notehigh (Notehigh) Int op('midi_filter').par.Notehigh

Default:

127

Range:

0 to 127

Cclow (Cclow) Int op('midi_filter').par.Cclow

Default:

0

Range:

0 to 127

Cchigh (Cchigh) Int op('midi_filter').par.Cchigh

Default:

127

Range:

0 to 127

Velthresh (Velthresh) Int op('midi_filter').par.Velthresh

Default:

0

Range:

0 to 127

Invert (Invert) Toggle op('midi_filter').par.Invert

Default:

Off

Options:

Off, On