For quicker and intuitive adding/removing of manual markers I would like to be able to tap and hold a marker in order to delete it please.
I am not sure that would be any quicker than just pressing the current del slice button, the chances of people missing the marker and just creating a new marker are pretty high with a long press.
It is less intuitive and slower to have to move to another button, just makes more sense to hold the marker you want to delete, I can't see anyone messing that up?
Unless you been drinking too much or stoned and then best not to be making beats as the next day the music always sounds awful.
It might be a good idea to increase the size of the inverted triangle on the marker anyway to help with moving its position. Speed over aesthetics in some cases.
infact a better solution would be to have a press/hold to create a marker as it is way too easy to create markers currently. You could then have a quick tap to delete the markers and it would work perfectly!