Stage Traxx Version/Build: [ST 4.0.12]
Device & OS Version: [MacBook Pro M1, macOS 26.1]

Dear support team,

Issue Description:
When MIDI Clock sync is enabled, the Clock generator runs in free-run mode independently of the MIDI transport messages (Start/Stop/Continue). As a result, the phase of the Clock stream is not reset when a Start message is sent. Each time playback is started, the receiving device locks its beat grid to a different position within the clock cycle, causing audible/visible beat misalignment between the audio output of Stage Traxx and any device synchronized via MIDI Clock (lighting software, DAW, etc.).
This makes MIDI Clock effectively unusable for tight beat-synchronized applications such as triggering strobe effects on lighting consoles.

Steps to Reproduce:
Open MIDI Settings, enable MIDI Clock sync.
Under Global MIDI Commands, set START for the Play action and STOP for the Stop action.
Load any song with a defined BPM (tested at 110 BPM).
Route the output to a MIDI monitoring tool (e.g. MIDI Monitor by Snoize) with System Real Time and Clock messages enabled.
Repeat the following sequence multiple times: Press Play → wait a second → Press Stop.
For each iteration, measure the time interval between the Start (FA) message and the next Clock (F8) message.

Expected Behaviour:
When a Start message is sent, the Clock generator should reset its phase so that the next Clock tick falls at a deterministic, predictable offset relative to the Start. This is the behaviour exhibited by Logic Pro and other compliant MIDI Clock masters: receiving devices reliably lock onto the correct beat phase, regardless of when playback was triggered.

Actual Behaviour:
The Clock generator continues to free-run regardless of Start messages. The interval between the Start message and the next Clock tick varies seemingly randomly between approximately 0 and ₂₂ ms (one full clock period at 110 BPM).
Measured data from 4 consecutive Play/Stop cycles at 110 BPM:
RunTime before Start (Clock → Start)Time after Start (Start → next Clock)Sum15 ms16 ms21 ms213 ms8 ms21 ms315 ms7 ms22 ms417 ms4 ms21 ms
The sum is consistently ₂₂ ms (one tick period at 110 BPM, 24 PPQN), confirming that the Clock generator runs continuously and is not reset by the Start message. The receiver locks its beat grid to whichever Clock tick happens to follow the Start, resulting in a phase offset that varies from 0 to ₂₂ ms between runs.
At 110 BPM, this represents up to ₄% of a quarter note, which is clearly visible when synchronizing visual effects (strobes) to the beat.
Comparison: the same test performed with Logic Pro as the MIDI Clock master produces a consistent Start → next Clock interval across runs, with strobes staying tightly locked to the beat after any Stop/Play cycle.

Suggested Fix:
Reset the phase accumulator of the MIDI Clock generator when sending a Start message, so the next Clock tick is emitted at a predictable position (typically immediately or at one full tick period after Start). This is standard behaviour for MIDI Clock masters.

Thank you very much for reading it.
And thank you for your amazing app !
I look forward building great shows with it 🙂

Yvan

Attachment:
Sorry for the format but here is a text report from midi monitor :
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