I tested with both the systems – MODEP on Bookworm and MOD repo build on Bullseye – and the results are the same. I tested with a few different plugins, and here are my findings:
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The first category contains plugins which have the “Translate value to musical tempo" option to set delay times. Some examples are the Invada Delay Munge, MDA DubDelay, and of course your plugin, the dm-SpaceEcho. The behaviour was the same as described in my previous post on both the systems – delay times update if tempo is changed manually in the UI, but don’t update when changed by MIDI CC.
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The second category includes plugins which have an internal option to sync the delay times to the host tempo and you can select from various time divisions. Some examples are the Bollie Delay XT and the Calf Vintage Delay. These plugins respond immediately to all tempo changes, whether it be dialled in manually, or set via MIDI CC assignment.