seppoman

cool :) "The world's first open source digital guitar effects"? They forgot to mention the Miss Parker though ;) http://www.axoris.be S

you could use a 2x15V transformer, too. and 50VA is quite a lot, that's more than 2A on each rail. I'd say even with an additional AOUT, something in the range of 20VA is plenty - 20VA are 10 on each rail, 10VA with 12V are about 800mA. A MBFM should need less than 100mA bipolar supply, same applies for the AOUT. You can't use a 230V primary transformer though, these would give you more than twice the rated output voltage. S

AOUT is not possible via J5. But I think that you're mixing up the terms. Pots are always connected to AIN! And each pot only needs one AIN pin. S

... audiocommander go go go :D ....

yes :) Very ;D Actually, connecting analog stuff is the original purpose of J5. (mis)using it as DIN or DOUT is the special case. Try searching the forum for "Joystick", there should be some results. S

well the datasheet looks very much like it's compatible. I didn't compare all the comand codes, but at least you can't damage it by connecting it like a HD44780. So just wire it up, your chances of making something wrong are not higher than with any other display :) S

Hmm you can't discontinue something that has never been mass produced / sold. Do you have any evidence one can actually buy this DAC anywhere in the world or for your price guess?? Can you point us to a place where you can order them in non-industrial quantity? I mean if you can't even buy it at Maxim's online store and they don't specify any leadtime or price tag, I consider this one a classical Vaporware device... S

you could use a good quality MP3, maybe use 192 or 256 kbps instead of the 24 kbps from last time ;) MP3 isn't an unusable format for this, only more than 128 kbps are necessary to be sure no artifacts are clouding the view :) S

Kartoshka, sounds like you still don't understand S1 doesn't want to buy that PCB ;D Fatom, I really don't understand if you need a SID synth that urgently why you didn't just use that PCB a year ago to build yourself a SID synth.... All these people waiting for parts kits and complaining because they're too lazy to dig into the parts list and order that stuff somewhere else is really beyond my comprehension. My 6582 PCB was making sounds less than two weeks after I got it. The case and panel isn't finished yet but at least I could make music for a year instead of complaining ;) S

And why do you need large external RAM and UARTs/FIFOs for that task? even with large buffers for each of your (few) Midi ports, you won't ever get close to being limited by RAM size. S

sure you could - the core can't detect if the AOUT is present so it's no problem to have the driver activated all the time. If there are physically independent PSUs, just take care that both units (and also the external filter) are powered from the same mains outlet to avoid large ground loops. Here's a link about modifying the NG for +-15V operation: http://www.midibox.org/forum/index.php/topic,10907.msg84344.html#msg84344 S

Hi Peake, the effects you're describing with that different cap value don't seem very desirable to me ;) I think the SSM already sounds quite warm and maybe slightly on the dark side as long as resonance isn't cranked up, so going even further in that direction and thereby losing resonance performance doesn't seem good to me. "why change it" doesn't sound bad ;D - the 820pF value for the fourth cap is suggested in the datasheet and used in every implementation schematic I found out on the net. I don't know the technical background why this is so, but it does work well for me. And the resonance problems suggest that changing that value too much somehow brings the filter "out of balance". Somewhere on the net I read a comment about someone having changed the cap values, but he changed all four caps while keeping the ratio between the two values constant. so if you want to tune the ssm slightly darker, maybe you could try using something like e.g. 1nF and 3x 12nF. S

Hi, it isn't possible to drive AOUTs only from a C64 PSU, you definitely need an extra center tapped or at least 15V AC transformer. The C64 PSU only provides 9V AC which is not enough. regarding output range: with the default values, the AOUT_NG has a max output range of around 0..11V or -5.5...5.5V depending on your calibration and resistor tolerances. But this range only comes from the resistor values chosen for good fine calibration in the popular use cases, i.e. V/Oct or +/-5V bipolar. if you need a higher range, this is possible by calculating a different gain ratio for the TL074s, i.e. using different resistor values. Another problem: the TL074 amps are not suitable for rail-to-rail voltages, i.e. even with a correct gain ratio, you won't reach the max/min +12 or -12V value. Maybe +-11V is possible. If that's enough for your application, then fine. If not, you need to power the NG from a +-15V supply and change the bipolar option's resistor values, too. Or you use LM324 amps instead that can reach near rail-to-rail operation (but these have slightly higher nonlinear properties and therefore are not a standard recommendation). S

Hi, the MAX's specs read very nice. Soldering TQFP is no real problem. The main problem with this DAC is availability and probably price! Availability - Neither Maxim's page nor findchips.com state any availability, estimated lead time or prices although the respective press release is from 2005! Maxim is known to offer a lot of parts that are not even in production - They're offering them and hope some big company shows interest and orders some 10,000 pieces. Only after such a large order they'll really be produced. I guess the 5763 is one of these "parts". The other thing is guessing a price - knowing that most MAX parts are quite good but also quite expensive (compare e.g. the MAX525...), I guess a 32 channel 16 bit dac with good specs will certainly be above 100 or 150 Euros. These concerns and also the fact that already 3 different AOUT modules exist make me believe that it's not worth putting more in-depth thoughts into a 5763-based module. (of course you can try to contact Maxim and find out more details :) ) --- About chaining: All available AOUT modules can be chained. Only thing that's missing is software support for that feature. NRPNs: that's also a pure software question and has nothing to do with the modules' hardware. S

2c hex is 44 decimal :)

8)

Hi jrp, here's a link to the Wiki page of my MBFM phone: http://www.midibox.org/dokuwiki/apparat_20_construction_blog (I know, after two years of break I should maybe continue that one soon... ;) - Anyway, there you'll find an example of how to internally simulate received patch change events. The code is a bit different because the program chages are triggered by a selfmade little 3x4 matrix, but you could also hack this function into some unused DIN buttons' code. S

well the sample rate and resolution of DAC and synth should better match or very ugly sounds would be the result ;) more info, also about polyphony: http://www.fit.vutbr.cz/~arnost/opl/lost+found/ymf262.pdf No. Very unlikely. And, allow me to get very offtopic for a second - if Creative had made any change to anything, they would've only made it cheaper and shittier - the OPL3 is about the only part of a SB16 that was not complete bullshit. I'm very happy that I never owned one because even listening to web radio through a SB16 would be a pain for me... I never had any respect for their products as each generation had similarly priced competitors' products that were way ahead of anything CL ever built. the difference would be around the cost of that chip, plus cost for mounting/soldering etc. Let's say 2 Euros - but I don't think the OPL3 is still in production and I doubt you could persuade Yamaha or any sound card manufacturer to change that, so this discussion is quite futile. The future is software, nobody except a few nerdy musicians would use it. Gamers wouldn't because all games have CD quality sampled soundtracks. Best is just to accept the facts - and if you want more OPL sound, just build an MBFM :-D S

hey crisp, I didn't see anyone crying about prices?? I only said you can get the TDA cheaper than from Segor :). Actually I don't see the SwinSid as a replacement for a real Sid because I expect a broken and dirty sound from a real Sid while I'd spend even more than for a TDA pr PCM1725 to get a really good sound from a SwinSid - for me the whole Midibox experience is absolutely not about saving money ;) S

no problem, just TK suggested that the sound quality of the PCM1725 was better. @Puddingbrumsel - 4.20 is too expensive. Another possible source for a (european?) TDA bulk order: http://www.ts-audio.de/pr_NED0008303.html S

PCM1725: TI says Not Recomended for New Designs and suggests using the PCM1754 instead (which is only available in SSOP package :-/) Farnell also doesn't stock them anymore. findchips.com lists several sources for the US but with a quick search I found no supplier in Germany.

Hi Kartoshka, read this: What do you think you will get? ;) S

The big plus of the GM5 solution is that we finally have the chance to get an industy quality custom driver for a cheap USB-MIDI chip. If the "complexity" was transferred into the driver, this would mean we couldn't use this driver and a custom driver had to be made. A good driver is exactly the thing that was missing for the previous Midibox-USB solutions, so willingly decide to not use the original GM5 driver would be one of the most stupid things to do. I'm wondering what's your motivation to question and complicate concepts before it was even fully tried out and tested? Can't you just be happy that a good solution seems near, wait like everyone else and then decide if that solution is suitable for your needs? S

??? use your brain.

Hi Swinkels, Congratulations and thanks for your work :) Will you upload the new source code, too? On your page I only found the source for the old SwinSid SE. And do you consider using English for the source comments of the new version? My Polish is a bit rusty ;) BTW, maybe I posted to the wrong thread last week, so may I draw your attention to this post: http://www.midibox.org/forum/index.php/topic,11258.msg89914.html#msg89914 S