#382

I don’t know what is happening right now but something is up…

I thought I had this input quantizing / note recognition thing working with
1:
X DIV QT IN N 1 N 1
CV 1 N X
And it is working fine for C0 - B4 ie notes 0-59, but almost exactly 5 V in (4.997 on the Fluke) is outputting N 59 instead of the expected 60.

I have checked with the Fluke and there is nothing odd going in.
There is a DC offset of 60 at the IN, but if anything this should cause problems rounding up to the next note above… this is the opposite.

Is this a bug?

Post edited -

OK I’ve been able to check the notes above C5 now -

What is happening is the voltage in that should calculate N 60 is calculating N 59
The voltage which should calculate N 61 is calculating N 60
But the voltage which should calculate N 62 is calculating N 62, and the rest of the notes up to note 84 all seem to be fine.

What has Teletype got against N 60 and N 61?

#383

[quote=“scanner_darkly, post:377, topic:596, full:true”]

i’ll second that - all this is excellent information

i’ll try and contribute when my tt finally arrives

#384

And I will tripple that ^^^

The more ideas/issues are discussed, the more we all learn.

#385

this sounds like a math rounding error. there’s probably a more accurate way to do this-- i’ll investigate.

#386

OK, good. I’ll continue.

My Teletype appears to have a calibration issue on the CV outs. Nothing major but still worrisome and worth checking if it’s just my Teletype or a universal issue.

Setting all CV outs to VV 75 then reading the outputs with multimeter

CV 1 - .749
CV 2 - .751
CV 3 - .763
CV 4 - .756

All outs set to VV 275

CV 1 - 2.746
CV 2 - 2.751
CV 3 - 2.772
CV 4 - 2.770

All outs set to VV 475

CV 1 - 4.743
CV 2 - 4.751
CV 3 - 4.781
CV 4 - 4.784

So CV outs 3 and 4 are not so reliable. I noted this when I used note numbers, too.

No, there is no significant voltage offset at CV 3 or 4 when nothing is assigned.

So regarding the tuning reference method mentioned earlier - I’ll be using CV 1 and 2 only until further notice.

#387

augh, i suspect this might have to do with resistor tolerances on the output stage. let me check some calculations. your unit is almost certainly fine.

#388

Just checking in.
Any word on this?
Teletype seems to be about the only module I own which works as I expect it to, mostly. So I’d like to use these outs ASAP, but right now I’d need to quantize them (which I can do).

#389

apologies, this test somehow didn’t make it on my list. i’ll see what i can do.

in the meantime you could CV.OFF (1-4) VV (offset) to tune each channel. annoying workaround.

#390

No worries.
I don’t mind annoying workarounds if they are just one line of code :wink:
So I’d figure an offset and enter it in the INIT script and it would be applied toall subsequent calculations? Or I’d need to add the line each time CV.a was addressed?

#391

offset gets applied to ever cv out command, correct. just an init line for each would do it.

#392

Can negative numbers be entered or would SUB 0 a or something be needed?

#393

Is that normal that a full CCW PARAM knob returns 4 as a value? :confused:

#394

that’s pretty unexpected. is it consistently that value? what does it give at max CW?

#395

min: 4, sometimes jumps to 8 ( can’t really tell cause the monitoring isn’t constant )
max: 16320
:neutral_face:

#396

Same thing here, more or less.
i am away for two weeks so i can’t test, but minimum is definitely not 0 on my unit. Maximum, i don’t remember.

#397

well, look at that. just tested and i sometimes see 4 on mine as well. the ADC is 12 bit, and so if there’s any noise at all (1 bit) it’ll get shifted to four, making it seem worse then it is.

i’ll fix this in in the next firmware rev (coming up later this month.)

in the meantime, you’re likely not going to notice this error given you’ll be shrinking your usable range-- see http://monome.org/docs/modular/teletype/studies-4/

#398

Ok cool, i wasn’t aware of that the hing till i used direct PARAM values. For now i’ll stick with the range shrinking.

#399

How would I enter a negative offset? I’ve tried SUB 0 a but no good. Mostly, based upon what my CV 3 and 4 are doing right now, I’d be wanting to get rid of a +ve offset.

#400

Is there a way to hard reset Teletype without powering down? Recently I’ve run into a couple of situations when I couldn’t reset CV outs to zero, or anything else (after failing with various offset attempts).

#401

offsets need to be positive, so the “most out” cc should be “zero”

no way to reset short of power cycling. there is an unpopulated reset switch on the back board.