Modulation intensity modes (bipolar, scale, add?)

[oskarsh]

Hey! What are your thoughts on the modulation intensity modes?

Currently, there are two types: Bipolar Mode and Scale Mode.

@Christoph-Hart, would it be possible to add an Add/Subtract Mode to the Modulation Matrix? The idea is to have:

•	An Add Mode that increases the modulation from the current parameter value.
•	A Subtract Mode that starts at the current knob value and reduces from there.

The modulation intensity would then control the range of these adjustments.

For instance, Scale Mode is not ideal when setting a table envelope on a filter to create a pluck sound, as it limits flexibility.

[oskarsh]

@Christoph-Hart is there a chance you can take a look at this. This would enable proper modulation modes.