I'm having some problems with groove. Mainly being I'm getting audio dropouts when using a [line~] to ramp the speed up to 1. from 0. or vice a versa over 5000ms.
I've checked this with both resampling on and off (not that it should make a difference).
I have also tried putting a dcblocking stage after groove incase slowing down that much creates some DC.
I've included a cycle at 220hz in the patch to illustrate the dropout.