Midi Clock Output
Mixxx includes a "MIDI for light" script that can send MIDI clock output for controlling lights or other MIDI synced hardware or software. The script requires no intervention as soon as you have configured it according to your needs. The DJ using Mixxx does not need to be disturbed during the event.
To use it, have the sound card with the MIDI output port plugged in or a virtual software MIDI output port created before starting Mixxx. Then select the MIDI output port in Options > Preferences > Controllers and load the "MIDI for light" script like a MIDI controller mapping.
The current deck is detected automatically. To achieve this, several mixxx-parameter are used. These are:
- The "crossfader"
- All deck "volume control"
- All deck "play/pause button"
The script must find out what mix method is used by the DJ. Use the
cross fader or the volume control? For this purpose, the cross fader is
observed. Is this more than 3 seconds in the middle position, it is
assumed that it is mixing by using the volume controls. Otherwise (the
cross fader is not in middle position): The DJ uses cross fader for
mixing.
To prevent a over charging of the light software, high frequency deck
changes are suppressed.
The best way to understand the automated deck change: Play a little in
mixxx while a simple light sequence, synced by beat, is running.
Probably the most common and simplest signal. You just have to know one
thing: When running multiple decks, only to the beat of the current deck
is send.
Tip: To get a better beat signal customize the options of "Beat
Detection" in the preferences. I use this combination.
The BPM (beats per minute) value is transferred every beat. The value range in midi is 0 to 127. To fit BPM value in this range: 50 will subtracted from BPM value.Example:
- BPM = 125, then the send value is 75.
- For BPM under 50 the send value is 0.
- For BPM over 177 the send value is 127.
Tip: I use it for automated changing of effekt speeds. Like rotation or macro speed.
If a deck change occur, a midi event is sent.
Tip: This can used to switch light sequences automatically or randomly. Or you can put your light in a defined status
Here you can choose from many different signals. All refer to the master VU meter. First distinction is mono-, left- and right channel. Next, a distinction is made between actual and calculated values. You have the choice.
In practice, the absolute value of VU does not generate large visible change to the light. For more visible change use calculated values. Calculated from the last 2 seconds.
Values with the label "meter1" to "meter4" belong together. So you can, for example, form a real VU meter.
The script sends MTC based on 25 frames per second. Only full frames be sent. No short message. By the use of full frames, a speed change (pitch) is no problem. It is also useful when creating a light show. Stop, forward, backward and jumps are transmitted correctly.
- The transmitted time code is determined by the current deck.
- Time code is transmitted only if the position (time) changes in the song.
- To send time code via midi can be switched off under "personal setting" of the script.
| action | note | value |
|---|---|---|
| deck change | C ( 48 / 0x30 ) | 100 / 0x64 (+new decknumber) |
| beat | D ( 50 / 0x32 ) | 100 / 0x64 |
| BPM | E ( 52 / 0x34 ) | BPM - 50 |
| VU mono current | E ( 64 / 0x40 ) | 0-127 / 0x0-0x7f |
| VU mono average min | F ( 65 / 0x41 ) | 0-127 / 0x0-0x7f |
| VU mono average mid | F# ( 66 / 0x42 ) | 0-127 / 0x0-0x7f |
| VU mono average max | G ( 67 / 0x43 ) | 0-127 / 0x0-0x7f |
| VU mono average fit | G# ( 68 / 0x44 ) | 0-127 / 0x0-0x7f |
| VU mono current meter 1 | A ( 69 / 0x45 ) | 0-127 / 0x0-0x7f |
| VU mono current meter 2 | A# ( 70 / 0x46 ) | 0-127 / 0x0-0x7f |
| VU mono current meter 3 | B ( 71 / 0x47 ) | 0-127 / 0x0-0x7f |
| VU mono current meter 4 | C ( 72 / 0x48 ) | 0-127 / 0x0-0x7f |
| VU mono average meter 1 | A ( 73 / 0x49 ) | 0-127 / 0x0-0x7f |
| VU mono average meter 2 | A# ( 74 / 0x4a ) | 0-127 / 0x0-0x7f |
| VU mono average meter 3 | B ( 75 / 0x4b ) | 0-127 / 0x0-0x7f |
| VU mono average meter 4 | C ( 76 / 0x4c ) | 0-127 / 0x0-0x7f |
| VU left current | G# ( 80 / 0x50 ) | 0-127 / 0x0-0x7f |
| VU left average min | A ( 81 / 0x51 ) | 0-127 / 0x0-0x7f |
| VU left average mid | A# ( 82 / 0x52 ) | 0-127 / 0x0-0x7f |
| VU left average max | B ( 83 / 0x53 ) | 0-127 / 0x0-0x7f |
| VU left average fit | C ( 84 / 0x54 ) | 0-127 / 0x0-0x7f |
| VU left current meter 1 | C# ( 85 / 0x55 ) | 0-127 / 0x0-0x7f |
| VU left current meter 2 | D ( 86 / 0x56 ) | 0-127 / 0x0-0x7f |
| VU left current meter 3 | D# ( 87 / 0x57 ) | 0-127 / 0x0-0x7f |
| VU left current meter 4 | E ( 88 / 0x58 ) | 0-127 / 0x0-0x7f |
| VU left average meter 1 | F ( 89 / 0x59 ) | 0-127 / 0x0-0x7f |
| VU left average meter 2 | F# ( 90 / 0x5a ) | 0-127 / 0x0-0x7f |
| VU left average meter 3 | G ( 91 / 0x5b ) | 0-127 / 0x0-0x7f |
| VU left average meter 4 | G# ( 92 / 0x5c ) | 0-127 / 0x0-0x7f |
| VU right current | C ( 96 / 0x60 ) | 0-127 / 0x0-0x7f |
| VU right average min | C# ( 97 / 0x61 ) | 0-127 / 0x0-0x7f |
| VU right average mid | D ( 98 / 0x62 ) | 0-127 / 0x0-0x7f |
| VU right average max | D# ( 99 / 0x63 ) | 0-127 / 0x0-0x7f |
| VU right average fit | E ( 100 / 0x64 ) | 0-127 / 0x0-0x7f |
| VU right current meter 1 | F ( 101 / 0x65 ) | 0-127 / 0x0-0x7f |
| VU right current meter 2 | F# ( 102 / 0x66 ) | 0-127 / 0x0-0x7f |
| VU right current meter 3 | G ( 103 / 0x67 ) | 0-127 / 0x0-0x7f |
| VU right current meter 4 | G# ( 104 / 0x68 ) | 0-127 / 0x0-0x7f |
| VU right average meter 1 | A ( 105 / 0x69 ) | 0-127 / 0x0-0x7f |
| VU right average meter 2 | A# ( 106 / 0x6a ) | 0-127 / 0x0-0x7f |
| VU right average meter 3 | B ( 107 / 0x6b ) | 0-127 / 0x0-0x7f |
| VU right average meter 4 | C ( 108 / 0x6c ) | 0-127 / 0x0-0x7f |
You can define the midi-signals they should be send. In the file Midi_for_light.js is at the top a block with variables for that. Mostly you define: Send this or not. But one variable is for setup of the midi channel. Attention. This is global for all events these are send by note.
| variable | default value | range of validity |
|---|---|---|
| midi_channel | 1 | 1-16 |
| enable_beat | true | true/false |
| enable_bpm | true | true/false |
| enable_mtc_timecode | false | true/false |
| enable_vu_mono_current | false | true/false |
| enable_vu_mono_average_min | false | true/false |
| enable_vu_mono_average_mid | false | true/false |
| enable_vu_mono_average_max | false | true/false |
| enable_vu_mono_average_fit | true | true/false |
| enable_vu_mono_current_meter | false | true/false |
| enable_vu_mono_average_meter | true | true/false |
| enable_vu_left_current | false | true/false |
| enable_vu_left_average_min | false | true/false |
| enable_vu_left_average_mid | false | true/false |
| enable_vu_left_average_max | false | true/false |
| enable_vu_left_average_fit | true | true/false |
| enable_vu_left_current_meter | false | true/false |
| enable_vu_left_average_meter | false | true/false |
| enable_vu_right_current | false | true/false |
| enable_vu_right_average_min | false | true/false |
| enable_vu_right_average_mid | false | true/false |
| enable_vu_right_average_max | false | true/false |
| enable_vu_right_average_fit | true | true/false |
| enable_vu_right_current_meter | false | true/false |
| enable_vu_right_average_meter | false | true/false |
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