pichenettes

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pichenettes
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  • -U efuse:w:0xFC:m -U hfuse:w:0xD9:m -U lfuse:w:0xF7:m (from the makefile)
  • > What's a composite out for editing? Something much less sexy than a video synth? http://www.dancetech.com/aa_dt_new/hardware/images/roland_s330_monitor_screenshot.jpg
  • Alternating between 113 / 114 is going to create some periodic clock jitter, and it will sound like the nastiest form of aliasing. Yesterday I did something stupid with my code which resulted in every 40th sample (at 39kHz) being offset by 5us. I wa…
  • Shruthi-1 v0.90 and v0.91 used a 16-bits phase accumulator which gave a +/- 10 cent pitch error on the lowest octave. Only one person complained. Shruthi-1 v0.92 and v0.93 had a mistake in the pitch table which made it tuned for A=442 Hz instead of…
  • I'm in too!
  • A few notes: The last time I mass-mailed people about the Shruti-1 kits available it was all "I was in a different timezone and sleeping", "I was at the dentist's", "My email client is configured to fetch mail every hour" - so I decided to give e…
  • I find black PCBs harder to solder. Sometimes you won't see a solder joint or lead because it's reflecting what's around it - and well, black doesn't reflect anything... "What's this thing poking my eye... oh that was a stealth lead..." It seems …
  • I used Wavelab as a sample editor with my S2000, through SDS (circa 99). It's really a well-known standard implemented on all hardware samplers. IIRC, open-loop (MIDI out of the computer -> MIDI in of the sampler with no communication the other w…
  • For 4) to make the result smoother (and indeed pretty similar to the timestretch of the old Akai samplers), you can crossfade back and forth between two granular players and make sure that the "hard" transition that will occur when skipping backward…
  • From this: http://createdigitalmusic.com/images/2010/08/synthcode.jpg Looks like the data will be stored on vanilla SPI eeproms.
  • Hmmm, I don't think they are going to burn special chips with the samples "written in stone" in them. The audio samples are going to be written somewhere on eeproms / flash and it'll be a fun hacking exercise to rewrite them with something else. Sti…
  • iirc, the WTPA originally did the mixing in hardware as you suggest. Don't know why this was dropped in favor of software mixing.
  • Overdubbing is done in the digital domain (contrary to what was done in very early hardware). Look at line 608 of the firmware, it's only a matter of attenuating outputByte. The naive thing to do would be sum = ((outputByte * feedbackGain) >&g…
  • @sealion: Strong objection to the sparkfun serial LCD. In retrospect, this is the biggest mistake I did on the Shruti-1. There's definitely something wrong with the firmware of this thing - settings occasionally reset themselves to strange values, w…
  • 8MB. Oh my! I had less than that on my S2000 :D Are you going to divide this into 32 equally sized blocks, or use a chunk/page index and allow non-contiguous blocks, or provide a "defragmenter" option? I'm thinking of the "I record small samples,…
  • The goal is to design a filter board for the Shruthi-1 with a built-in VC-controlled chorus/delay. The filter/VCA will be simpler than on the other boards, so it's probably going to be a 2-pole SVF or maybe a MS-20 type thing, to make room for the P…
  • doesn't really compare to the biscuit... it's a full-blown synth, the biscuit is not. there seems to be a very flexible modulation matrix, and more importantly, signal routing system. But again, the price!
  • Delay-ey, flangey sounds? Wait, wait, I'm coming! http://farm2.static.flickr.com/1368/4733873350_df6f16da45_z.jpg 529€ is hmmm... expensive.
  • To me, the envelope follower was something happening in the analog world, for the benefits of the analog world (sampling it by the main ADC would complicate things and would just not feel right). It would be more something for those using the WTPA a…
  • The only drawback in doing the envelope tracking in software is: - the extra CPU cost - getting an integration time of around 10ms (which is the smallest integration time I would use to track smoothly an envelope - I usually use 20ms in all my ech…
  • @blue_lu: I just feel I wouldn't learn much by doing it - it would be too close to a rehash of the Shruthi, with some audio read from a DAC and/or a RAM chip instead of computed oscillators. Also, I've worked quite a lot on the Shruthi-1, and I'd…
  • There are some fancy things in the circuit (true bypass), but for the rest of it, you pay for the build quality, fancy encoders/buttons, and the designer's parisian flat :D If I remember well, the filter is a 2-pole SVF. To me it seems pretty str…
  • I had another idea: an envelope follower on the audio input, that could be used either as modulation source for effects, to control an external device via a CV out, or maybe for flashing/blingy/pulsating LED effects. Op-amp+diodes for the half-wa…
  • Jumping on this... Glad you stay with AVR. I'd suggest you to go with a 644p just to make a lot of room for future firmware improvements. One thing I regret with the Shruti-1 is that the firmware is so packed I can't add much to it without first rem…
  • Is it the full LM358 or just the half? With a half, I'd go with a sallen-key LPF. With the two halves I'd hack something like the VCF section of the gristleizer. Another useful thing: some simple tone control/bass boost.
  • @Altitude: This 8-steps thing is interesting, it looks like a Gorf ^ 4. Indeed I would be happy to point some of the people asking me for a minimal seq to this project. @Todd: The point is to 1/ draw a line and say "I won't go further than this l…
  • The big gotcha is that this is not a sequencer - this is a custom MIDI/OSC controller for a piece of sequencer software. So you cannot use this without a computer behind the scenes :( I don't want to shift the topic, but I am interested on my sid…
  • @Altitude, regarding getting a negative rail... In fact for the Shruthi I switched to the LT1054 (which roughly does the same thing but is not pin-compatible) for two reasons: - It handles up to 15V. I had reports of two people who had to replac…
  • Maybe it's specific to the OS X version, but in File/Print I see a button for exporting a PDF
  • Figuring out the VSTness of a .dll (at best | strings | less, at worst a trip down dllexplorer) isn't that hard. But alright, let's keep people speculating... A toy being a closet VST host is still the silliest thing I've read this week, besides the…

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