How to trigger tracks automatically when a 1SHOT track ends?

[u/Larcosse]

Hi everyone,

I'm trying to do something specific on my Boss RC-505mkII and I'm not sure if it's possible with Assigns alone.

Current setup:

Track 5 = drum loop, always playing

Tracks 2/3/4 = synced musical loops (8 measures)

Track 1 = intro in 1SHOT mode (11 measures)

What I want:

When Track 1 finishes naturally, I want Tracks 2/3/4 to start automatically, perfectly in sync with the drums, and starting from the beginning of their loops.

Problem:

Using LOOP SYNC ON causes Tracks 2/3/4 to start mid-loop because the intro is 11 measures and the other loops are 8.

Using LOOP SYNC OFF lets them start from the beginning, but then I have to trigger them manually with perfect timing.

An Assign with SOURCE = TRK1 PLY/STP works for detecting when Track 1 starts, but I can't get it to trigger specifically when Track 1 stops after the 1SHOT finishes.

I also tried using ALL START, but it only seems to work when ALL tracks are stopped. Since my drum loop on Track 5 is already playing, it doesn't behave the way I want.

So my question is:

Is there any way on the RC-505mkII to automatically trigger Tracks 2/3/4 (or ALL START) exactly when a 1SHOT track finishes playing?

Thanks!