00:00 <whitequark> i tried driving the speaker with single-bit output from Glasgow directly

00:00 <whitequark> it sounds surprisingly okay because the speaker acts as an LPF

00:00 <whitequark> ... that being said, i did it at 30 MHz :P

00:00 <Wohali> i played with a PERQ workstation this past weekend, it uses a CVSD chip for audio

00:00 <cr1901_modern> https://www.youtube.com/watch?v=HstgfH9FWV4 (loud) Same idea is how this demo was done on IBM PC

00:01 <Wohali> only a 3-bit shift register, though. pretty grainy.

00:01 <Wohali> but hey, delta-mod audio let you fit an entire Madonna pop single on a single 8" floppy in 1980!

00:01 <Wohali> (well, madonna, so 1984.)

00:01 <Wohali> (but the hw was unchanged since 1980.)

00:02 <whitequark> nice

00:02 <cr1901_modern> why "pretty grainy"?

00:02 <Wohali> effective sample rate is about 16k

00:03 <cr1901_modern> if the shift register was wider you could stream more 1-bit samples per unit time?

00:03 <Wohali> actually, might have been 8k, need to look at the schems again

00:04 <Wohali> the chip is effectively an audio codec for telephony, so speech sounds good, but music sounds horrid

00:04 <cr1901_modern> (basically I'm asking what does the shreg width have to do with the sample rate? :P)

00:05 <Wohali> looking for the datasheet to send you. hang on.

00:07 <Wohali> https://www.datasheetarchive.com/pdf/download.php?id=c19293408d802e43e7cf32790624e2b5a4881c&type=M&term=MC3417

00:07 <cr1901_modern> tyvm

00:08 <Wohali> it's effectively your bit depth

00:08 <cr1901_modern> Oh I think Lord_Nightmare was discussing this chip last month

00:09 <Wohali> (it has the MC3417, not the 3418.)

00:16 <cr1901_modern> Yea this is a cool chip

00:17 <cr1901_modern> (Also if it isn't clear yet- Lagrange point has an excellent soundtrack and I really need to find time to play it)

00:18 <cr1901_modern> whitequark: Following on from yesterday, do you plan to set up an OPLL chip on your gateway?

00:18 <cr1901_modern> Wonder what'll happen if I feed the Lagrange Point VGMs through it

00:19 <fseidel> if you enjoy the Lagrange Point soundtrack, you may find this amusing: https://www.youtube.com/watch?v=GjI53drya1E

00:19 <fseidel> joke take about 25 seconds to occur

00:19 <cr1901_modern> I find High Quality Rips guy obnoxious

00:19 <cr1901_modern> But ty for trying

00:19 <cr1901_modern> sincerely :)

00:20 <fseidel> I was sent that video a while ago by a friend who didn't realize it was a joke and was asking me why the simpsons theme was in a FC game

00:21 <cr1901_modern> Just to stoke the flames more: Grand Dad/Fleenstones was funny for like 5 seconds. And I only enjoy Vinny.

00:42 <cr1901_modern> https://www.youtube.com/watch?v=dj4E52CaT5M Looks like this video was done w/ a hardware mod alone (no need to hack the music driver data)

00:43 <fseidel> I think they're register compatible, right?

00:43 <fseidel> it's just that the default patches are different?

00:43 <cr1901_modern> right, but I thought the patches might've been swapped around so that the vrc7 "trumpet" isn't in the same place as the opll trumpet, for instance

00:44 <fseidel> ah

00:50 <cr1901_modern> some patches _sound_ identical between opll and vrc7 tho

00:55 <fseidel> I take it the actual patch values are slightly different, though?

00:57 <cr1901_modern> We'll find out soon enough :P

01:20 <ej5> perhaps of some interest for this crowd: earlier today i found the first ad for the XLR connector: https://twitter.com/TubeTimeUS/status/1111668627864875008

01:28 <whitequark> ej5: oh, are you TubeTimeUS?

01:29 <ej5> yeah

01:29 <ej5> i guess you're whitequark on twitter XD

01:30 <whitequark> yep

01:30 <whitequark> as well as... everywhere else

01:41 <cr1901_modern> If I wasn't attached to my "random" jumble of numbers and letters, the handle I would probably choose is "sema4" (pronounce it phonetically)

01:42 <fseidel> oh that's cute :-)

01:42 <cr1901_modern> Not the programming concept either... the train signals :P

01:50 <whitequark> ej5: what are you using for cross sectioning like that?

01:50 <whitequark> is it a waterjet cutter?

01:51 <whitequark> wait, no

01:51 <whitequark> the tool marks don't match up

01:51 <whitequark> it must be a grinder of some sort, but grinding off half of a LED without melting it is not easy

01:51 <whitequark> i'm confused

01:57 <ej5> i started with a dremel, then i finished it with a piece of sandpaper.

01:57 <whitequark> huh.

01:59 <ej5> basically used the dremel to remove most of the material

01:59 <ej5> then i scrubbed it flat on a piece of sandpaper to get it closer to the thickness

02:00 <ej5> finished it with super fine grit sandpaper.

02:18 <Wohali> ej5: nice ad!

02:19 <ej5> thanks :)

02:22 <cr1901_modern> Where is there a cat? Not complaining, but just wondering

02:25 <Wohali> cats walk quietly

02:27 <cr1901_modern> true...

03:00 <whitequark> ugh, counterfeit OPNAs

05:12 <whitequark> anyone has a real OPNA die shot?

05:12 <Wohali> soz

05:21 <whitequark> i did a dumb thing and bought from a random seller even though my known good seller had some OPNAs

05:21 <whitequark> oh wll

05:22 <Wohali> it happens

05:29 <ej5> i did a dumb thing and bought from some random internet person

05:30 <ej5> for a good cause though: http://www.industrialalchemy.org/storearticleview.php?item=76

05:32 <Wohali> ej5: oh, is that your site? nice.

05:32 <ej5> not my site.

05:32 <Wohali> is www.decadecounter.com also yours?

05:32 <Wohali> ah. n/m.

05:34 <whitequark> wow, what

05:35 <whitequark> what IS that thing

05:36 <ej5> i'll find out when it arrives :)

05:41 <Wohali> oh i've seen those before

05:41 <Wohali> that's like a diaondtron

05:41 <Wohali> diamondtron unit

05:41 <Wohali> very neato

05:41 <Wohali> looks fun!

06:24 <cr1901_modern> https://twitter.com/whitequark/status/1111859312090120192 It looks like you got... something Yamaha-ish. Looking forward to seeing this under the microscope

07:24 <cr1901_modern> nukeykt: Is your OPN2 core libvgm compatible?

07:24 <cr1901_modern> or would someone need to convert to the libvgm API?

07:36 <nukeykt> You mean this: https://github.com/ValleyBell/libvgm ?

07:36 <nukeykt> My cores already there i think

07:37 <cr1901_modern> Oh I see... the gens, the mame, and the nuked cores are there, and you choose which one you want at compile-time

07:39 <cr1901_modern> Blaaargh, this is gonna make writing Rust bindings fun. I was hoping to get away with using bindgen once, but compile-time defines == I can't do that anymore.

07:41 <cr1901_modern> oh wait... you can have all three enabled at once

09:15 <Sarayan> hey whitequark

09:16 <Sarayan> send me your physical address at galibert@pobox.com so that I can send you the sc01a

09:16 <Sarayan> I'll do that on tuesday morning in all probability (then I catch a plane to bucarest :-)

09:18 <whitequark> Sarayan: done

09:19 <Sarayan> cool

09:19 <Sarayan> something went wrong with your 'scope?

09:20 <Sarayan> anything specific to put on the package to make things so nicely through customs?

09:20 <Sarayan> go

09:44 <cr1901_modern> wow... 40 users at the same time

09:48 <whitequark> Sarayan: my scope should be fine... what makes you think that?

09:49 <whitequark> re customs, just "computer parts" or "integrated circuit" is fine

09:49 <Sarayan> ok

09:50 <Sarayan> "I'm gonna get a real microscope and retake." made me wonder, is all

09:52 <Sarayan> the big area in the middle is interesting, since it looks like a big rom

09:53 <Sarayan> and to the right could be a standard yamaha oscillator llop

09:53 <Sarayan> that die shot is really intriguing

09:56 <whitequark> Sarayan: oh, MICROscope, not oscilloscope

09:56 <whitequark> i got confused

09:57 <whitequark> yes, the microscope is pending new half silvered mirror and its realignment

09:57 <whitequark> need it to get better pictures

09:57 <Sarayan> ahhhh

09:57 <Sarayan> the previous broke?

10:13 <whitequark> yeah, i replaced it but it doesn't work well enough at 40x

10:17 <Sarayan> need better alignment?

10:17 <whitequark> yes

10:27 <ValleyBell> cr1901_modern: You can enable/disable any sound core in libvgm at compile time. But by default it just compiles everything so you can choose them at runtime.

14:05 <cr1901_modern> Anyone who has used both... any opinions on lpk25 versus apk mini?

14:05 <cr1901_modern> Also...

14:05 <cr1901_modern> "Keyboards can be used to trigger drum sounds, but are impractical for playing repeated patterns such as rolls, due to the length of key travel."

14:05 <cr1901_modern> >https://en.wikipedia.org/wiki/MIDI_controller#Drum_and_percussion_controllers

14:05 <cr1901_modern> This referring to the time it takes for a key to go back up to resting position?

14:13 <l_oliveira> morning

14:14 <l_oliveira> well, drumsticks versus keyed instruments, yah I suppose it's a lot faster for the drumstick. With digital instruments that goes all way out of the window of course

14:22 <cr1901_modern> So the ultimate goal is to: Buy a MIDI controller, create an interface to play FM music from said controller. Either from libvgm or creating a microcontroller program which converts MIDI to register writes on a physical FM synth (since Windoze doesn't have virtual midi)

14:23 <cr1901_modern> whichever is easier :P

14:36 <l_oliveira> putting it on better terms: music performed by scripting is not limited by physics, I suppose

15:00 <cr1901_modern> ej5: https://twitter.com/TubeTimeUS/status/1111735505459118080 High quality meme

15:01 <ej5> thanks man, the template is really taking off so i figured i'd ride the wave XD

15:01 <cr1901_modern> memes are either good or obnoxious IME. Never in between :(

15:02 <ej5> apparently people like cross sections, who knew.

15:03 <cr1901_modern> And human mucus

15:03 <cr1901_modern> *honk*

15:04 <l_oliveira> ew. down with the mucus

15:05 <ej5> i'm trying to think what else i should cross section.

15:05 <cr1901_modern> Well an electrolytic cap is unironically interesting inside

15:06 <ej5> messy to section due to the liquid inside

15:06 <l_oliveira> when I read mucom I think "music compiler" not "mucus" hahaha

15:06 <cr1901_modern> maybe pair it with an equivalent circuit model that shows where ESL/ESR comes from

15:06 <l_oliveira> sorry I am that boring

15:06 <cr1901_modern> hah

15:08 <l_oliveira> love the aesthetically poetic way you post electronics, my good sir.

15:08 <ej5> basically i could do an electrolytic cap but i'd have to release the schmoo first

15:56 <nukeykt> Wrote hilarious Ym2612 core today based on... VirtualPC's OPL3 emulator, haha. VPC's core is worst OPL emu i ever heard, so i was curious what if YM2612 was emulated instead. Here's zip with sources and VGMPlay with this core added https://drive.google.com/file/d/14i0GE5tYeBDXDQ_hNhYa6byYVYGsHf94/view?usp=sharing This core sounds really bad, much worse than early ym2612 emulation efforts

17:00 <superctr> <cr1901_modern> So the ultimate goal is to: Buy a MIDI controller, create an interface to play FM music from said controller. Either from libvgm or creating a microcontroller program which converts MIDI to register writes on a physical FM synth (since Windoze doesn't have virtual midi) <- I believe ValleyBell wrote a YM2612 midi interface (and windows pre-10 did have midi support, maybe 10 still does though it's hidden)

17:01 <superctr> It's also possible to use a VST host and feed MIDI messages into VOPM or something

17:10 <superctr> also, re: playing drums on keyboards: https://www.youtube.com/watch?v=fqM7bN3Kc7I

20:46 <ValleyBell> Yes, I made a MIDI driver that emulates the MegaDrive hardware. https://forums.sonicretro.org/index.php?showtopic=25337&view=findpost&p=934762 if anyone is curious.

20:49 <ValleyBell> In order to use it, you need to load a .GYB instrument library (YM2612 instruments). Loading a PSG envelope list file (.lst) and a drum mappings file (.map) is required if you want drums via MIDI channel 10.

20:50 <ValleyBell> FM channels can be accessed via MIDI channel 1-6, PSG via 11-14. Channels are mapped 1:1, so they are monophonic.

20:52 <ValleyBell> It works fine in Windows 2000, XP and 7. I heard people having issues with it under Win10, but I didn't have time to investigate that yet.