Circular looper overdub with record~ always resets to beginning

Hi everyone,

I'm building a circular looper in Max using buffer~ / groove~ / record~.

Everything works except the overdub behavior: when I activate overdub, record~ always restarts writing from the beginning of the buffer instead of following the current playhead position of groove~.

I understand this is the native behavior of record~ when it receives an int 1 on inlet 0. The toggle driving the overdub is connected directly to record~ inlet 0, which causes the reset.

I've tried:

Removing the toggle record connection and using gate~ to control the audio signal instead

Using poke~ with the sync output of groove~ multiplied by the buffer size in samples

Neither approach worked correctly in my setup.

The gate~ approach still has issues, and the poke~ approach introduced other problems.

The patch is a stereo looper with blend control (sound-on-sound style), tape noise via gen~, and wow/flutter. I'm attaching a screenshot.

The question: what is the correct, reliable way to overdub into a buffer~ following the exact playhead position of groove~, without resetting the write position on activation?

This is the pathc

Any working example or approach would be hugely appreciated. Thanks!