[sdiy] 8bits, 10bits or12bits DAC for a midi2cv converter?

[jean-pierre.desrochers at ville.quebec.qc.ca]

Hi list,

Seeing the posts about the paia's midi2cv8
I was wondering what 'should' be a good DAC
for a midi2CV output range of around 0 to 8vdc (8 octaves)?
I'm thinking of building one from scratch
with a PIC controller. I saw PAIA's is
using an 8 bits DAC which only will gives a 256 steps
resolution... For example if you need 10 steps between
all semitones (half of a note) to get
rid of any 'staircase' effect between notes,
that gives 256/10steps per semitones = 25 notes span
which is 2 octaves.. Not very usefull.
In revenche a 10 bits DAC with the same needs
would give (1024/10steps per semitones)/12 notes per octave
gives more than 8 octaves.
Am-I correct? A 10bits DAC would be more valuable?
Do I miss something?

Any opinions welcomed.
JP