> I raised a query on the Fluidsynth list, and they suggested trying with
> the command-line
> version of fluidsynth. I tried that and it responded as it should -
> which suggests the
> problem is in the Calf Gui. I guess I should raise it with the Calf list
> (if I can find it.)
>
> I assume that LV2 uses either Alsa or Jack to communicate, but I've not
> used LV2 at all.
> Certainly Fluidsynth, and hence Calf, is quite happy using Jack. I don't
> know about the
> other Calf plugins, as I've never used any, other than the synth.
I think I found the cause, LV2 version indeed is fine...� it's a change in calfjackhost done in 2018:
To me it looks that this commit is just plain wrong in raising the channel number by one.
The intent (see issue #97 referenced in this commit msg) is to compensate the offset seen in calf monosynth and other synths, but apparently this change simply increases the input buffer channel by one...
So I changed line 197 in jackhost.cpp from:
�int channel = (buffer[0] & 0x0f) + 1;
to read:
�int channel = (buffer[0] & 0x0f);
and this fixes the off by one error in fluidsynth, and it seems the other synths still respond on correct channels, even if displaying 0-15 in their MIDI channel selectors.
(tried with Mamba virtual keyboard on my laptop, which also displays channels as 1 - 16)
>
> Bill
>
>
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