default values for controls when doing arithmetics

[felixroos]

it could be useful if there was a mechanism for controls to specify a default value. Example:

stack(s("bd"), note("c eb g")).lastOf(3, add(note("1")))

when lastOf is active, s("bd") will have a very low speed, because no note was set explicitly.
The add operation seems to use 0 as a fallback, which is very low in the case of note.
It would lead to a more usable outcome if there was some way to use the default value of the control that is being added to, if no value has been set. The default value for note is "c2" for samples (s("bd") sounds like s("bd").note("c2"), also see #339).
That default value is currently defined somewhere in the sampler, which is not connected to the much lower level arithmetic logic (and should not be connected).
For me, the most logical fix would be to add a lower level api for default values:

setDefaultControlValue('note', 'c2')
setDefaultControlValue('note') // c2

not sure how much this would entangle output (superdough etc) and core pattern logic..