AE TBD as a quantizer?

Scales, custom-scales, and non-octaval (non-1V/oct) tunings.
o_C comes with > 100 predefined scales (modifiable in the source code) plus 4 user-defined scales editable directly through the module user interface; for details on the scale-editor, see Quantermain below; for more information on custom scales see here; for a list of the predefined scales, see here.

many of the predefined scales are microtonal i.e. they have more than 12 notes per octave, or they are subsets of tunings with more than 12 notes per octave. o_C supports scales with up to 16 notes per octave (but those 16 notes are arbitrary and themselves can be subsets of scales with many more than 16 notes per octave).

Non-octaval tunings for the xenharmonically obsessed
in addition, it’s possible to select from a choice of alternative non-octaval tunings (per channel):

Wendy Carlos alpha scale
Wendy Carlos beta scale
Wendy Carlos gamma scale
Tritaval tuning (as used by the Bohlen-Pierce macrotonal scale), and
Quartertone scale (which essentially downscales to 0.5V/oct)
some of these non-octaval tunings are designed to work with particular scales eg the Carlos tunings work well with normal 12-TET scales, while the tritaval tuning is intended to work specifically with the Bohlen-Pierce scales and related harmonic scales — see the full list here.
the alternative tunings can be accessed by long-pressing the left encoder in the scale-editor. (Select the channel turning the right encoder; the left encoder is used to select from the choice of tunings). Use of alternative tunings is indicated by a dashed line underneath the top menu row (the line is solid when using the default 1V/oct).