Auto Calibration

[Wobble]

Sorry if this is painfully obvious but could someone shed some light on what the auto calibration feature is?

I'm Pesk by the way, nice to meet you.

[kongbalong]

i don';t know about that feature, but i like your music pesk

-craig

[Amos]

Hi Pesk,

The auto-calibration allows the LP to measure it's own oscillators frequency response to the different pitch voltages for each note... and then make tiny adjustments to the voltage so that every note is in perfect tune. It's something you'd want to run overnight or while you do something else, as it tends to take rather a while (up to 90 minutes or so)... but in that time it is calibrating each note individually for each oscillator until they are all dialed in to within .1 cents of concert pitch. The end result sounds incredibly good across the entire playing range and makes detuned and interval patches much more playable and euphonious. It is a nice feature... for live use there is a different "auto-tune" mode that will allow you to set a target pitch for the LP to maintain, and it will automatically correct itself to this pitch even as temperature changes around it, for example when the hot stage lites come up... I haven't monkied about with the auto-tune much, but Cyril tells me it works well.

[Wobble]

Hi Amos, that sounds like a cool feature. Thanks for the reply.

P

[DeFrag]

Will the LP keep its tuning between reboots? What I mean is, if I use the fine tuning knob & set a non-modulated C with a tuner, we can disable the fine tuning knob (for performances & such) but if we turn off the LP & fire it back up again the next day, will the OSCs warm up to close to the finely tuned setting I previously made? That is, how accurate will it be or how often would we have to dig into the master menu to re-enable fine tuning, tune it, & disable it again?

[dlearyus]

anyone have any idea when it will be available?

[rachel]

Calibration is different to tuning. You tune relative to the calibration of the synth.
Calibrating means to set the scale of the octaves in such a way that Equal temperement is
kept across the keyboard from the lowest note to the highest. I would assume that this
process is stored in some sort of voltage controlled lookup table and the value for each
set when you poweron, but I have no idea!

When you tune, you're doing it across the
whole oscillator and setting it relative to the scaling of the keyboard - ie you could tune to a
perfect A 440 but if the keyboard was not correctly calibrated, it would drift from that tuning
on the highest and lowest notes.


rachel

[DeFrag]

I notice that if I fine tune my LP with a BOSS TU-2 tuner on streaming mode (+/-3cents), I'll tune middle-C with no modulation & the 2nd Osc level @ zero, the C notes in all other octaves are off almost a semitone. The further from the "tuned" note, the further its off. Wazzupwitdat?

[MarkM]

How long after you turned on your LP did you check the tuning? It takes a little while for the tuning to stablize.

[electrical_engineer_gEEk]

I notice that if I fine tune my LP with a BOSS TU-2 tuner on streaming mode (+/-3cents), I'll tune middle-C with no modulation & the 2nd Osc level @ zero, the C notes in all other octaves are off almost a semitone. The further from the "tuned" note, the further its off. Wazzupwitdat?

I noticed this on my modular using the same tuner.....I thought this tuner was supposed to be the best in the industry (for price and size) but I'm thinking it's pretty bum!

[DeFrag]

How long after you turned on your LP did you check the tuning? It takes a little while for the tuning to stablize.

Hours. I also realize that a wavering modulation will affect it so I turned down the 2nd Osc & wheeled the mod all the way down.