layer solo/bypass fade

[Zoltán]

I would like an option when soloing or bypassing layers:
on solo , the other layers fade out instead of cutting them instantly,
on bypass, the current layer fades out, with the layers transition time instead of cutting it.
and when disabling solo or bypass, it would happen with transition too.

[Kadete]

+1
that type of cuts on live really don't work well, and with the timer we can always choose 0 ms for the current behaviour