On the other hand if @Joe is right, then a width of 1 would allow the full range of the incoming saw to be applied which would make sense. When I have turned the width all the way up it seems to work and this would take out some of the variability of what’s happening and firmly seat the responsibility of focus on the saw, which also makes sense!
I need to try it again
edit: and yes, the fade parameter doesn’t seem to solve the interpolation as I originally hoped, I think this is just because it is only applied at the beginning as per @odevices diagram above.
edit 2: if i set width to be 1 then the gain settings on the saw output need to be super low to make sense, this is probably because I am using long single cycle waveform chains, they would be fine at higher values with shorter chains. The width parameter results in less waveform being played either way.
edit 3: I am finally getting some very nice morphing results, with the help of a filter to take the noise out a bit at the top end and a grid quantiser to ‘step’ the modulating sine wave on the phase it kinda jumps nicely between waveforms - feel really close now!