Problems with clock synch between StageTraxx IPad and Macbook Logic Pro X

CaelumWraith

I'm using StageTraxx on my iPad. Fantastic app guys very well done. While I've managed to get iPads tp synch their clocks so that one StageTraxx starts the other, I'm having a terribly frustrating issue with getting Stagetraxx to properly manage the clock for Logic Pro. I can see that the clock signal from the StageTraxx session are being received across my MacBook Pro Midi Network, and Logic does begin to play, but, as you can see from the attached image, it for some reason forces the clock to -8 bars and when it gets the start signal, it moves to -9 bars (and change) and stops. I've tried many different variations of settings of the clock and frame rate on Stagetraxx and dozens of different configs on the Macbook, but no luck. All I am trying to do is get the midi song on logic to play at the same time as the StageTraxx running on the iPad. Any help would be greatly appreciated.

CaelumWraith

Sorry for the duplicate image.

peter

Midi clock only sends the tempo and no position information. So I have no idea where Logic is getting the position from?

Or do you send Midi Timecode? In that case make sure the timecode offset setup in song details and Logic match.

bens

Not sure if this will be useful to you, but I wrote a little utility that takes a midi file (exported from Logic for instance) and converts the midi messages into the timecode format that StageTraxx uses.

https://github.com/subdigital/midi2stagetraxx

Here's an example:

 cargo run -- -m  "Enter Sandman - Metallica - lights.mid" \
   -o 4

This is overriding the midi channel (the -o flag) for all events.

(This currently requires a Rust development environment, but I can supply binaries if there's interest)

Output looks like this:

MIDI FILE: Enter Sandman - Metallica - lights.mid
Quarter Note Division: 480
-- EVENT: 0 Meta(MidiChannelPrefix(Channel(3)))
-- EVENT: 0 Meta(TrackName(Utf8("(Mapped Instr.)")))
-- EVENT: 0 Meta(InstrumentName(Utf8("PHOTON")))
-- TIME SIGNATURE: TimeSignatureValue { numerator: 4, denominator: Quarter, click: Quarter, tpq: 8 }
-- EVENT: 0 Meta(KeySignature(KeySignatureValue { accidentals: KeyAccidentals(0), mode: Major }))
-- SMPTE OFFSET: (SmpteOffsetValue { hr: 33, mn: 0, se: 8, fr: 4, ff: 11 }) frame: 24, hr: 1
-- Tempo change: 120.36229049438812
[midi@00:00.099: CC1.127@4]
[midi@00:02.990: N24.127@4]
-- EVENT: 960 Meta(Marker(Utf8("COUNT IN")))
[midi@00:04.237: N24.0@4]
[midi@00:07.726: N35.127@4]
-- EVENT: 240 Meta(Marker(Utf8("INTRO")))
-- Tempo change: 121.19938915507866
-- Tempo change: 118.15372981786604
[midi@00:15.717: N35.0@4]
[midi@00:15.721: N29.127@4]
-- Tempo change: 120.73697851686694
[midi@00:23.673: N29.0@4]
-- Tempo change: 122.80335498765825
[midi@00:23.926: N72.127@4]
-- Tempo change: 124.54721896438987
-- Tempo change: 121.65869464275939
[midi@00:31.488: N72.0@4]
[midi@00:31.488: N29.127@4]
-- Tempo change: 124.2583330744618
-- Tempo change: 122.64195295045879
[midi@00:39.313: N29.0@4]
[midi@00:39.313: N33.127@4]
...

I take this output and pipe to grep midi | pbcopy to get just the midi messages on my clipboard and paste into statetraxx.

Nullsaurus

bens I'll give this a try thanks! I have a Rust installation locally.

Nullsaurus

Sorry one more question. Is the idea here that I export the midi track to get the message data, and this will cause StageTraxx to align the clock between Logic Pro X?

bens

Nullsaurus Logic is only used here to design the midi, then you export the midi file and enter in ST3. During the live performance only ST3 is sending the actual midi.