work-in-progress DIY looper/glitcher

[cloudscapes]

Figured I'd work a little on my looper project today, here's a 3-second aphex twin loop getting mangled:

[youtube]http://www.youtube.com/watch?v=eka7dL_mH2M[/youtube]

The two pots define both the start and end loop points, though right now they're buggy. the pushbutton reverses. Slowing down and speeding up is planned, as well as other stuff. It'll have delay functions too.

Right now I'm mostly working in code. I'm using an AVR clocked at 12MHz. I tried clocking it faster but I had problems. Sound is 8-bit and I'm using the AVR's own ADC for conversion. It's then stored in an external RAM (23K256, only 32KB, around 3 seconds worth at 11khz lo-fi) and then outputted on an external DAC (MCP4921).

I'm kinda pushing the chip's limits right now, and the additional functions I want to add will bog it down even further (meaning less khz), so I ordered an xmega kit which will be MUCH beefier! Only problem is that they're surface-mount only.

[Nychthemeron]

Damnit cloudscapes, first you work with some awesome people up in montreal, and now this?

How many kidneys do I have to sell for this?

[cloudscapes]

I'm thinking I'll start simple. like 2-4 seconds max loop/delay (unless I go with a beefier chip).

-slow down/speed up pot
-grain window size and shift pots (shifting the loop start and end around)
-feedback pot (for overdub)
-eq on the feedback
-hold/loop mode, and delay mode
-reverse button
-grain rearrange in both delay and hold modes
-wet/dry

I have this crazy idea of building a delay with ringmodded repeats (just basic ringmod pitch and blend controls), so tha tthe already ringmodded repeats getting ringmodded and folded again, over and over as they fade! fucking awesome! but I'll leave that for another project.

they don't call me a "crazy scientist" at 33:08 of this clip for nothing!

I *think* I can achieve this with the current tech. not for months, though.

[Nychthemeron]

cloudscapes you are mad

mad awesome

[Jero]

I'll be waiting

[tuffteef]

creative
your brain must be juicy and plump

[smallsnd/bigsnd]

BAD ASS

i would seriously love to talk about micro programming sometime! any good starting points?

[cloudscapes]

BAD ASS

i would seriously love to talk about micro programming sometime! any good starting points?

I started with (and am still using) Bascom
http://www.mcselec.com/
which is just a basic programming environment. I like it's relative simplicity (compared to avr studio or whatever) and the language couldn't be easier (being basic). I took basic in high school so I already had the fundamentals. I had also started with the STK200 evaluation board (found on various sites). Took a few days to get everything working, sadly. the bascom has some nice examples:

http://www.mcselec.com/index.php?option ... &Itemid=41

You can try using their EDB kit instead of the STK200.

The compiling environment isn't tied down to the kit, either. There are many AVR evaluation kits all around and Bascom will compile for all of them. It's just often you'll need to use the kit's own "flasher" to download the code into the chip.

I'll post more later. It's my lunchbreak.

[Dandolin]

Inarticulate

[cloudscapes]

http://nearworlds.org/stuff/glitcher_test_2.mp3

[Nychthemeron]

can i place an order now

i will give you an arm as collateral

[01010111]

can i place an order now

i will give you an arm as collateral

+1
cloudscapes, you are a wizard.

[oldangelmidnight]

How 'bout an LFO to vary the slow down/speed up?

[cloudscapes]

here's a neat little feature/knob I added today. pushing time-stretching and mangling to the limit

http://nearworlds.org/stuff/wtf_looper.mp3

what happens when you "virtually" push the reverse button up and down really fast? how about hundreds or thousands of times a second? this.

[smile_man]

Baw, so down with this idea.

http://nearworlds.org/stuff/glitcher_test_2.mp3

what song is this?