Tempo fluctuations while using external clock

[k_king]

First-time poster here - I love my Prophet 6, and I've started integrating into a workflow with some older synths lacking midi. I picked up an SND ACME-4 analog clock generator, and, for all intents and purposes, it works just fine.

Here's my issue - on the P6, the tempo is constantly flashing between the BPM given by the clock and the "---" symbol. This causes no problems with sequencing; however, any clock synced effects are just constantly regenerating as if the BPM was restarting from 0 every 16th note.

I imagine this is an issue with the nature of my clock generator, but I'm curious if anyone is aware of any workarounds on the P6 that might help.  Thanks!

[extempo]

When the P6 is set to sync to external MIDI clock, and there is no MIDI clock signal present at the MIDI input, then the BPM display will show "---". If there's no incoming clock, then there's not reference for tempo! If you have a way of sending a constant stream if MIDI clock data to the synth, you'll be good to go.