12-16-2020, 11:01 PM

I am curious as to the precision of note values the NerdSeq is capable of. I have a decent meter with good precision and have calibrated my Seq according to the manual.

The 0.000v and -5.000v offsets are exact (no half-digit), the CV/Mod outputs are all exactly 0.000v and 10.00v (I chose the value balancing between 9.999v and 10.00v).

Unfortunately I'm having problems with tuning. I'm using a Tides (2018) as an oscillator, I am running that through a tuner and checking the CV voltage with my meter. On CV1 I have set up from C-0 to C-6 and trigger each one:

C-1 = 0.994v (7.2 cents flat)

C-2 = 1.998v

C-3 = 3.001v

C-4 = 4.006v (7.2 cents sharp)

C-5 = 5.008v (9.6 cents sharp)

C-6= 6.014v (16.8 cents sharp)

So from C-1 to C-6 there is a difference of 24 cents or 1/4 of a semitone. I admit my meter and math may be off.

I calibrated my non-pro KeyStep with the same meter and was able to get only 5mv difference between C1-C6, 6 cents total and stable, no sharps or flats through the octaves (C1 = 1.000v, C2=2.001v, ..., C6=6.005v). The difference between the KeyStep and NerdSeq is noticeable to my tuner and ear.

I tested all the CV outputs and some of the Mod outputs and the results are all over the place. CV5 out is the most accurate of my outputs across the octaves with only a cent or two variation.

Am I doing something wrong? What is the theoretical precision of the NerdSeq and component tolerances? I can dial in precise voltages using the Mod outputs and hex values, any reason the CV v/oct isn't as precise?

EDIT: I was mistaken, CV5 output isn't much more accurate than the rest, a few consecutive octaves are very close though. Still has 12 cent swings between octaves. I'm guessing the 12 bit nature of the NerdSeq is to blame? I hope I'm wrong.

The 0.000v and -5.000v offsets are exact (no half-digit), the CV/Mod outputs are all exactly 0.000v and 10.00v (I chose the value balancing between 9.999v and 10.00v).

Unfortunately I'm having problems with tuning. I'm using a Tides (2018) as an oscillator, I am running that through a tuner and checking the CV voltage with my meter. On CV1 I have set up from C-0 to C-6 and trigger each one:

C-1 = 0.994v (7.2 cents flat)

C-2 = 1.998v

C-3 = 3.001v

C-4 = 4.006v (7.2 cents sharp)

C-5 = 5.008v (9.6 cents sharp)

C-6= 6.014v (16.8 cents sharp)

So from C-1 to C-6 there is a difference of 24 cents or 1/4 of a semitone. I admit my meter and math may be off.

I calibrated my non-pro KeyStep with the same meter and was able to get only 5mv difference between C1-C6, 6 cents total and stable, no sharps or flats through the octaves (C1 = 1.000v, C2=2.001v, ..., C6=6.005v). The difference between the KeyStep and NerdSeq is noticeable to my tuner and ear.

I tested all the CV outputs and some of the Mod outputs and the results are all over the place. CV5 out is the most accurate of my outputs across the octaves with only a cent or two variation.

Am I doing something wrong? What is the theoretical precision of the NerdSeq and component tolerances? I can dial in precise voltages using the Mod outputs and hex values, any reason the CV v/oct isn't as precise?

EDIT: I was mistaken, CV5 output isn't much more accurate than the rest, a few consecutive octaves are very close though. Still has 12 cent swings between octaves. I'm guessing the 12 bit nature of the NerdSeq is to blame? I hope I'm wrong.