change sync_kwargs to false for convolve
@@ -42,6 +42,7 @@ class Convolve(Transformation):
_groupable = False
_input_type = 'variable'
_return_type = 'variable'
+ _sync_kwargs = False
def _transform(self, var, model='spm', derivative=False, dispersion=False,
fir_delays=None):
