Echopraxia

I kinda answered my own question with your help :) On some of the pads I noticed that the trace goes to another pad which does not need to be occupied and then the trace continues to its destination. I forgot that the current would still pass through the middle pad. PS Like how you were able to fit your logo in there. It would be cool to get your logo on the front panel cut out with custom diffused acrylic window with red beat led behind it. Maybe on the back by the jacks so people at shows can go "what the hell is that!" :) Regards, echo

I was thinking just send in the top panel to fpe and have them cut,paint it and send it back to me. And about the order of things, I forgot to get the required resistors for the leds as I thought for some reason the resistor networks would take care of that. oh well back to frys:) I will probably have some build questions like the resistor hole/pads leading to an open hole/pad then going to the appropriate led pad/hole. I don't get it ...yet:)

Hey Wilba, Got my parts! I wanted to know if I can start soldering all the pieces (besides the leds) now while I wait for my panel. I read your construction guide but am still not sure if I should go ahead and start soldering diodes,resistors,switches,caps and headers while I wait for my panel. Would there by any reason to NOT DO the soldering now? I would like to test out the control surface in the meantime. And also here is a case I was thinking of using with your pcb and a core32 and probably without an internal power supply. http://parts.digikey.com/1/parts/5626-box-sloped-alum-17x11-3-blk-blu-1456rl1bkbu.html http://www.hammondmfg.com/pdf/1456RL1.pdf http://www.hammondmfg.com/pdf/9c2pg78-81.pdf Any reasons why this case might not work? It has a 10 degree slope which I would think is better for standing up and looking down on it rather than sitting position. I know it is over 2x times the 5" length but we could all use some place to rest our wrists while playing the thing :) I just thought I would post this here in case any one else wanted to try to use this case as well. I think its around $40 US and its aluminum and has a black top panel and the rest of the case is textured blue. Regards, echo

So pretty! Thanks guys!

Nice one. Is the power supply circuit inside or did you have to connect it externally?

Excellent demo TK. The LFO and repeat fx turned out great! The step progression is a really fun and useful tool. You should practice that song and play it live for friends and record it when you do. Regards, echo PS any updates with Smash and the core32 boards?

Yes. I meant he did the panel design. Right?

That would be nice Julien. Maybe we can find out how much it would cost for the 31 orders of just the panel and then additionally a case. Wilba made the panel and doug is making the case so I assume we might just do the panel if we go this route? Concerning the people who are on the mini bulk order who would be interested in doing this? Regards, echo

Well I am still trying to trouble shoot this issue of not having all notes playing. I seem to get different variations of the problem each time I fire up the synth. I am getting all 5v voltages from the interconnection test checking each pin on the ymf chip one by one. The ground pin is good as well. What about the rd pin #7? Should this be getting 5 volts? As of now I am not because it was a pin that the solder pad come off from desoldering previous. Would this note behaviour happen because of this missing 5v? Are there any apps or methods out there that can help me check the other pins. the only other ones would be the clocks, do and smp pins. Regards, echo

Awsome design! I wish I had the know how to make my own custom boards. Would you maybe do a pcb bulk run for us midi boxers? I still have to read through the article but are you editing sounds with cc messages? Any sound samples? Regards, Echo

I wanted to do this for my tr-707. I remember seeing these flexible flat led strips about the size of a business card that I thought maybe would work. I will try to find them again.

Thanks for the suggestion. I tried running in stereo with the same problem. Upon further testing to timing is solid. The weird thing is that at first one note would play then the next wouldn't then the next would and so on. I attached an audio example of a simple bar of 16 steps that should play 16 notes but only plays 8 notes and the second part of the audio file should play 8 notes but only plays 4. Now it does something else in that the first two notes should play then three notes would not play and then two more notes would play then 3 more would not. Sounds like a short or bad chip. Any help would be appreciated. Regards, echo

I am curious if its the crystal that is causing the midi notes to miss/lag or the yac 512s? It wouldn't be the tl074s right?

I also attached what the song is like with vsts to verify I am not going crazy. It does play a lot more of notes. vst test metalman.mp3 vst test metalman.mp3

Hello everybody, I got my mbfm to play sounds today finally. These sounds take me back. I had to replace the ymf262 and directly solder some of its wires to j2 pins because first only the test tone was working but now it works. The only problem is that when I play something in my computer sequencer I don't get every note that is being played on the sequencer. I get like 3 notes playing then 2 don't play then 3 notes play then 2 don't and so on. Is it a polyphony mono legato thing? when I play the keys sequentially I get two notes that can sound then go down and the next two keys will not sound, then go down and the next two keys will sound and so on. Is it a short some where. I have the 18f452 with v1.9f. Any help would be appreciated. I attached an mp3 of an old mega man midi file playing the mbfm. Regards, echo mbfm test metalman.mp3 mbfm test metalman.mp3

Ok tested test tone app and got an audio signal. Now I loaded mbfm app and get no audio. Jsynthlib app was able to change the name of the patch on the core's lcd. I think it might be the ymf262 solder pads still might need direct wire connections to components. I would assume that I got audio because only a certain pin gets triggered on the ymf262 in the test tone app. But in the mbfm app more ymf262 pins are needed for control of audio. Is this a good assumption? I will try to solder wire tomorrow. If there might be something else to try let me know. regards, echo

[glow=red,2,300]echopraxia does happy dance[/glow]

Well I found out it was my ymf262 that exploded. I took out my only remaining one and soldered that one on and now it works! The test tone apprears to play just fine. except that now I don't hear anything come out of audio out #4. I looked at the schem and see that it goes to the last tl074's I3- and 03 pins. Where do those pins go after that? I am trying to see if maybe one of my yac512s got screwed in the destruction of reverse wiring my 12v power supply and having the core connected to the same power strip as the 12v and the opl3 board was connected to the 5v from the core when it happened. So I am happy for now. But I had some solder pads come off of the opl3 pcb where the ymf262 goes.(a few of them >:() I put some solder on all the ymf262 pins still but I am not sure if I may still need to run some direct wiring from ymf262 to components? So I am hoping that I can trace down where the last tl074's I3- and 03 pins go to do voltage checks of the audio out #4. Regards, echo

Spot on design! HOw are you gonna use it to control your lighting. Will this be a midi sequencer to light show kinda thing? Regards, echo

Very pro looking! Nice desk too :)

Sorry if I am misunderstood TK. I thought an internal clock divider was used for each track so you could have have your hi hat track playing at 1/32nd and have the rest of the beat playing at 1/16th. Can this still be done? Its been awhile since I played with my unfinished MBSEQ. Regards, echo PS nice demo of the tempo changes. The question remains if you can do those tempo changes and change a pattern at the same time not using automation.

OK so now I tried to desolder my (most likely fried) opl3 chip from the opl3 PCB and sure enough I ended up taking off other solder pads that were relevant to the boards survival. So I take it a 40 watt iron is just too hot for desoldering. Of course its the only iron I have. And I still have to take out the yac512 chips and probably will have the solder pads get lifted off on those as well. So crap... So I guess easiest thing is what stryd said Other than that I woudl have to some how put new pads on or repopulate a whole new board. I don't think using cut resistor leads and scratch off some solder mask to make a bridge would work because the cut lead would cause the smd chip to lay uneven. So let me just think of a worst case situation where all the chip's solder pads fall off the PCB. Would you just hold the chip with a helping hand and solder wire directly to the smd pins which then go to correct components on the board? This should be fun. I will try to get the other chips off and start from there. Wish me luck cause I'll need it. Regards, echo

thanks for the input. I had a feeling it would come down to replacing something. Will post results.

Cool I just wanted to test them out to see if I broke my tl074s. I can take them back to radio shack if needed.

I just got some quad op amps from local radio shack. The pin connections are the same but wanted midiboxers input if there is anything wrong with using these instead of the tl074 LM324 4 internally compensated high gain op amp. Regards, echo