1 Reply by Mister Sombrero

(15 replies, posted in LittleGPTracker)

I decided to give up on the A440 waveforms downloaded from tone generator websites and just stick with the SCWF chip samples from renoise.

These samples are at C (C4 I think).
in loop mode they are perfectly in tune over all notes and octaves..
In oscillator mode they are almost in tune over all notes and octaves, just slightly flat.
(The samples are in renoise 2.8 instrument folder - chip - chiptriangle, chipsine, chipsquare, chipsawtooth)

As for the adventurekid waveforms,  "+2" means they are D, sharp by two note octave cents.
My guitar tuner registers his perfect waves as being in tune in normal loop mode at detune values from 79 to 7D.
Using AKWF samples with the test tone sample and tuning by ear will be awesome too.

I dont think I really need to use oscillator mode anymore...as everything can be perfectly in tune anyway...
Next, ill check out creating hand drawn SCWFs for LGPT in milkytracker...should be cool

thanks for reading my questions and helping me out.

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2 Reply by Mister Sombrero

(15 replies, posted in LittleGPTracker)

Sorry for the double post here.

I tried my guitar tuner with renoise and every note using renoise's included chip instruments registerd as being perfectly in tune (including FM sine).

LGPT oscillator tuning test 1

I took the A440 test tone sample from http://onlinetonegenerator.com/...
I reduced it to a mono single cycle waveform.
I loaded it into LGPT.
Switched to oscillator mode (loop end was 64 / 100decimal).
Notes played in tune if root note was set at C2.

LGPT oscillator tuning test 2

basic waveform samples taken at A440 from audiocheck.net (440Hz, 1 sec, -3db, 8Khz).
Cut them down to single cycle waveforms using renoise, chopping at zero crossing to get exactly 1 cycle.
Loaded them into LGPT.
Changed to oscillator mode...(loop end was 12 / 18decimal), Root note was A...
every note played out of tune...
Changed to root note C...still out of tune (consistently by one semitone)..
After I changed the root note to Csharp every note played perfectly in tune.

LGPT normal loop mode + oscillator mode tuning test

Extracted the single cycle waveforms from renoises included chip instruments (triangle smooth, triangle complex, chip triangle, chip square, chip sine FM, chip sine, chip sawtooth, chip saw smooth)

They will be in tune in normal loop mode if root note is C3.
They will be in tune in oscillator mode if root note is C6.

---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------

if LGPT expects A440, root note C in oscillator mode...the renoise single cycle chip samples should be more out of tune in normal loop mode as the root note was C and not A.

Also these waveforms were behaving really strange in terms of tuning:

basic waveforms at A440 from audiocheck.net (440Hz, 1 sec, -3db, 8Khz) loop end 12

(because they played absolutely perfectly in tune across all octaves and notes, but only if root note was Csharp)...WTF?

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3 Reply by Mister Sombrero

(13 replies, posted in LittleGPTracker)

I made some basic waveform samples at A440 on audiocheck.net (440Hz, 1 sec, -3db, 8Khz).

I cut them down to be single cycle waveforms using renoise, chopping at zero crossing to get exactly 1 cycle.

Loaded them into LGPT. Changed to oscillator mode...loop end was 12, Root note was A... every note was played out of tune...

After I changed the root note to Csharp..every note was played perfectly in tune (notes in the pattern editor matched the pitch of notes played).

LGPTs oscillator mode works in a weird way.

I tried single cycle waves (from the same website) at A440,44.1Khz as well and these were not really tuneable. No matter what the root note was, the pitches did not reflect the notes shown in the pattern editor. weird.

Seems like the oscillator mode requires a particular length of ?A440? single cycle wave, perhaps also a particular sampling frequency to work properly...maybe it matches gameboy waveforms or SID waveforms or something else?

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4 Reply by Mister Sombrero

(13 replies, posted in LittleGPTracker)

Hey, thanks again.

Found this website for making A440 basic waves to be cut into single cycle afterwards:

http://www.audiocheck.net/audiofrequenc … letone.php

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5 Reply by Mister Sombrero

(15 replies, posted in LittleGPTracker)

Adventure kid has confirmed that the "+ 2"  means 2 note octave cents...
D2+ 2 note octave cents (slightly sharp)

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6 Reply by Mister Sombrero

(13 replies, posted in LittleGPTracker)

Thankyou for the help and the info. Much appreciated. monowave looks cool, many instruments out of only one sample.

By  "a single cycle waveform will be FF in length" does it mean:

oscillator mode is designed to use only SCWFs of length FF? (longer or shorter SCWFs will be out of tune) / I should only use SCWFs of length FF in oscillator mode?

The reason I am asking is that the single cycle waveforms within monowave appear to be 256 long instead of 255 "every 0x100 increment skips to the next waveform"

Thanks for the help

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7 Topic by Mister Sombrero

(13 replies, posted in LittleGPTracker)

What types of single cycle waveforms are best for use in LGPT's oscillator mode?

1.) Should the SCWF be exactly A440Hz for the tuning to be calculated correctly?

2.) In the LGPT10k sample pack most of the SCWFs are $100 or $FF samples in length..is there an advantage in using this length for oscillator mode? (perhaps with PLOF, LPOF or RTRG?)

3.) What exactly is the difference in the way a SCWF is looped in loop mode and oscillator mode?

4.) What is the advantage of using oscillator mode rather than normal loop mode? Should I just use normal loop mode?

LGPT mailing list:

"[LGPT] makes certain assumptions about the root note of the cycle...assuming that your
oscillator waveform is tuned to A440 or whatever the base assumption is
about that mode (it's been a while since I made a Piggy track with oscil
so I can't remember)"

(sorry for posting all these questions at once)

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8 Reply by Mister Sombrero

(15 replies, posted in LittleGPTracker)

Thanks for the link. That will be very useful

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9 Reply by Mister Sombrero

(15 replies, posted in LittleGPTracker)

I think your right about it being a problem with the tuner, that its possible aliasing throws the tuner off and that the tuner may be optimized for guitar frequencies. I used it to try and check the pitch of some of the AKWF fm waveforms and it could not even register that a note was playing.
If I use the perfect waveforms the note always shows.

thanks, your right...in theory the pitch should stay accurate as Im using SCWFs and not other types of short loops or one shot samples spread across the keys..."difference in pitch in terms of cents stays about the same, but as you go up the scale the difference in terms of Hz grows"

Although the guitar tuner was registering flattened notes I couldnt make out whether the notes I was hearing were flat or not by ear.
Thanks for the tips about sample frequency and phase increment.

I sent adventure kid an email asking about whether the D2 is raised by 2 cents or what he meant by "+2". If I get a reply I'll post the answer here. I should buy a more accurate tuner for future use. Thanks for all your help. Much appreciated smile

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10 Topic by Mister Sombrero

(15 replies, posted in LittleGPTracker)

I downloaded some single cycle waveforms from adventure kid's website.

He says he has pitched the samples at "D2+2"...(some of them are "D1+2")
Does this mean "D octave 2 plus two cents", like a slightly sharp D2?

I looped them in LGPT (with root note set at D2) and tested the pitch with a guitar tuner.
From D2 (going up in semitones) until about D4ish all notes registered as correct...as I got higher than that the notes were flatter (seems normal for a short looped sample spread out across many keys in a tracker).

On the LGPT instrument screen 'loop end' shows as '258' making me think he might mean 256samples + 2samples....

"+2" has confused me and my guitar tuner may not be good enough to register +2 as a sharp note/out of tune... so I came here to ask if anyone knows what it means...any help will be very much appreciated

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11 Reply by Mister Sombrero

(159 replies, posted in Other Vintage Computers & Consoles)

subzero adtrack2 formula:

"BPM (theoretical) = TEMPO * 60 / SPEED
But as far as I know, the BPM-way of measuring song tempo is based upon drum beats in it, while in AT2 tempo gives you processing frequency of pattern data and speed its slowndown factor wink"

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12 Reply by Mister Sombrero

(159 replies, posted in Other Vintage Computers & Consoles)

thanks for such a quick reply!

"You cant! ha. I have tried so many times, but the time clock within AT2 never will line up with BPM"
"Matching tempos from DOS trackers to each other or BPM is just a nightmare!"
"Yes it will drift"

lol, damn! thats a shame. Adlib 4 op sound is really nice and the tracker is so configurable and with such a great help file.
I'll stick to sunvox with 2op fm for now. Your tracks are great! Looking forward to more 02star videos.

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13 Reply by Mister Sombrero

(159 replies, posted in Other Vintage Computers & Consoles)

Hi, I have a question for 02star or other experienced AdlibTracker2 people...

How can you convert AdlibTracker2's speed/tempo value such as 6/50Hz into regular BPM?
I want to sample AdlibTracker2 to use in another tracker.
I hope there wont be any of the drift you mentioned in another thread if I sample one pattern at a time.
What do you think? cool youtube videos by the way!

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