creekree

futureman, thanks for your reply. getting a burst of three consecutive triggers might very well be doable with a chopped down version of ken stones burst generator. i actually had some exchange about that with creatorlars in a different thread. anyhow, this still does not solve the problem of the fourth trigger... the one that goes off after the last one (of the burst generator, if you will) and which is connected to the second trigger input. thanks or posting the trigger conversion circuit... although i already was aware of it. i am already using it in my box, as my first post says. i was hoping someone could point me in the right direction, codewise. where do i change timing settings and such? for someone without experience the whole coding thing is a little bit overwhelming... you see, i still have the same questions as in post #1: . an answer along the lines of "open file xyz and look at lines 124 through 260" or something similar would do me more good than a hint to try something with 555s... but i appreciate your answer. it's just not exactly what i was looking for.

anyone?

hi all, i need some help from someone that knows his way around MIOS. i am currently building an analog drumbox based on the mb808, and i am making very good progress. however, there is one problem that i will not be able to solve myself, because i have ABSOLUTELY NO CODING KNOWLEDGE WHATSOEVER. i am using the analog voice board of a boss dr 110. the instruments require an s-trigger and not a v-trigger, so i used the moog trigger circuit (basically just one transistor) with great success. however, the clap is giving me headaches. let me explain: the clap need TWO trigger signals, there are two trigger inputs. one of the trigger inputs needs a burst of THREE triggers with a length of 10msec each (so the total time of the burst will be 30 msec), and THEN a single trigger of 10msec on the second input. (i can provide exerpts of the service manual to visualize this, if needed. its super simple actually). so, i need to know two things: 1.) how can the mb808 firmware be changed so that one instrument trigger is sent out to TWO pins of a DOUT shift register? 2.) how can the timing of these triggers be changed to match the "dr 110 clap" requirements? it would be super awesome if someone with decent coding knowledge could chime in. i had a look at the mios code (hoping to find some clues), but frankly this is just gibberish to me. i know that at least one more person here would find the solution to this problem helpful as well (hey sebo, how's life in argentina?) thanks for reading!

check your PM..

the three triggers are already defined in setup_808_default.asm you dont have to probe for voltages to find where the signals "come out", look for and read the annotations. you get to see which track hangs off which pin on which shift register (and you can change it). just be sure not to mess up things up to badly, or your conga might sound when in fact you programmed a bassdrum; or a LED might light up instead of a snare sounding ;) you need the accent circuit three times because the mb808 only has a global accent - one accent track for all voices at the same time. if you just used the one that is already on the pcb it would trigger 1) whenever an accented step is set, and 2) programming your ext trigger would fire the accent as well; not something you want to have. if i understood you correctly, you want one (or three) dedicated trigger outs for your sh-101 (or modular synth stuff) peaking at 15v. you need separate accent circuitry for each of your "ext" tracks - it does nothing more than shift the trigger voltage from 5v to 15v - which is exactly what you want uhm, btw: you can rename the tracks to something more appropriate, like "SH-101 " or so, as long as it is exactly 6 characters long.

there are 3 more trigger lines, called ext1 to ext 3... use those. as for 15v level, copy the accent circuit from the mb808 pcb (you'll find it documented in the eight-oh-eight forums) 3 times and hook them up to the DOUT pins for ext 1 to ext 3 (specified in your configuration file). thats it. i know it works, because i did the same ;) please note that i do NOT own an original mb808 pcb, so i do not know if there are pins on the DOUT shift registers free or if they have all been used. in the worst case you might have to add another shift register.

....but doesnt that mean that whenever i press shift OR play the other button will be activated as well? your method actually shortens the DINs of shift and play together- permanently. pressing either switch will make a connection to GND for both inputs. youre right that this way the tap tempo function can be put on the encoder, but i'd really like to be able to press play on its own ;)

anyone?

hi, i just finished my mb808 seq (not moogahs though), everything went smoothly. 8) now, i know i can tap the tempo in with shift+play, but is there a way to use the switch in my tempo encoder? i am pretty sure it is just a minor change to the firmware, but in all honesty, i have no idea how to program it, nor did my search bring up anything helpful. any help appreciated! christian

creatorlars, i am going for the 909 kick found at http://www.msc175.de/geraete.htm - it looks very weel thought out and the samples are convincing. the site is in german, but the documentation should be pretty self-explanatory. if you have trouble understanding something found there contact me - i'm happy to translate for you. i am aware of the CGS burst generator, but as you said, it might be overkill. also i have space issues - i'm going to build a desktop unit and space is pretty limited in the enclosure that i have (but it is sooo beautiful, just wait and see..). so far i only plan to use microlarges toms, as i have a snare, clap, cymbals and hihats in the DR110. the voice board is already modded to have control of the voices and sounds pretty cool. IMO the DR110 clap is the best one around, so i am desperate to get it working. i might even use the noise source of the DR110 for all of the other voices, depending on how that sounds. on the other hand, a second noise source might be a nice idea (with switches for each instrument to select between the two and even cut it out). the 808 toms apparently are fed with pink noise... ah well, further experimentation on my behalf is needed. do you have experience with feeding different kinds of noise into the 808 toms? i am not going to build yet another 808/909 clone that tries to be as faithful as possible, i'm more after "something of everything", if you will. for instance, one secret weapon will be a DS7 clone ;) right now i am sitting in front of the DR110, building v to s trigger converters for it. if only the sequencer was up and running! i am still waiting for some parts to finish it.

creatorlars: thanks for your input. let me explain what i am about to do... i have a broken DR110, the digital board is fried, however, the analog board (and thus all of the voices) are functional. the DR110 analog board has individual trig inputs but only a global accent input. (they´re s-triggers, so i'll use the moog v to s trig conversion circuit.) lets assume this will be "accent group 1" - one accent track to serve all of its voices. i cant see a way to have individual accents for each of these instruments, so i'll just stick to what Boss developed here. now, i also am currently building one of microlarges 808 tom boards - as you said, i'll need the accent circuitry found on the eight-oh-eight forums. there goes "accent group 2"... also i have a 909 kick module that i'd like to throw in for good measure ;) -> "accent group 3" (of course a single instrument is not a group, but let's forget about that for the moment). again, the accent circuit will be employed. at least i assume that the 909 kick works the same as the 808 instruments... so here we have three different voice groups - being able to have individual accents for each group with it's own accent pot is IMO a nice thing. since my mb808 seq is not finished yet i can not play with this global accent and figure out what it actually does... why is the DEFAULT_GLOBAL_ACCENT variable specified when i can just rename any track to "acc X" and hook it up to accent circuitry???? on a sidenote: the DR110 clap needs two triggers, one pulse on trig input 1 and a burst of 3 consecutive pulses on input 2. i assume this can be taken care of in the firmware, alas, i have no idea of how to do that. it is not my primary concern right now and i'll try to figure it out later in the building process. however, any input is welcome :)

hi, all, i was wondering if there is anything wrong with defining more than one accent track for a mb808 sequencer, given that the analog drumcircuits feature a second/third accent input, of course. normally i'd say that there shouldnt be a problem, as i simply would have to connect one pin of a DOUT shift register to the trigger in and one another to the accent in. i then could label those shift register pins in "setup_808_default.asm" as, for instance, "BD1 " and BD1 AC" or something similar. however, the one thing that got me wondering is this entry in setup_808_default.asm: ; define the track which is used for global accent ; (0=disabled, 1-16: track number) #define DEFAULT_GLOBAL_ACCENT_TRK 16 what is this global accent track and how would it affect my idea of having more than one accent track? remember, there would NOT be ONE SINGLE accent trigger connected to ALL my analog voices but one for a bassdrum, one for a group of instruments and a third to another single instrument. (i have my reasons for that, will reveal more later when the time has come to reveal something ;) ) thanks!

excellent! exactly what i was looking for. thank you very much!

hi, can someone kindly point me in the right direction, please? i want to have a bpm display (3 digits) on my mb808-sequencer "clone", but i cant find relevant information on how to connect the 7 segment LED displays. i found out there are two different kinds: common cathode and common anode. which ones do i need? thanks! chris

its not so much that i found a mapping chart somewhere... i opened setup_808_default.asm and noticed which buttons were disabled and which were enabled... this is a pretty good start. also i learned that i can assign any pin of the shift registers to any function; something that had previously not occured to me. so the answer is: it doesnt matter which button on the frontpanel is connected to which pin of DINX4 as you can match that in the software at any time. (this probably is totally obvious to most of ucapps members, but being drawn away from the project for such a long time i totally forgot everything i once knew about midiboxen)