No worries, always good to get feedback :)
There was a post on the forum awhile ago about noise on attack which ended up with a BoM updated... C3 was changed to 10nF.
https://forum.gmsn.co.uk/t/noise-on-attack/221/5
Is that the same issue or something different? Maybe having such a wide range isn't such a good idea.
Also AndyC has written an alt firmware... https://forum.gmsn.co.uk/t/v-1-01-on-github/600