widdly

Finished my 5x5 interface on the weekend. It worked first time whooot!! I soldered 10 midi cables.....never again. Take TK's advice and buy some cheap ones instead. I used a plastic case and mounted those metal panel mount sockets on the front. It all sits around the back of my rack so need for it to be pretty. Now every one of my rack units has an individual in/out. Thanks ploytec and TK. One question, is the firmware in the GM5 upgradable or is it masked? I'm wondering if a fix for the device names from eprom is feasible.

Mine arrived safe and sound in Singapore. Thx TK. ;D The resistor markings on the PCB silkscreen are kinda strange. It has R6,R11,R12,R14,R15,R28,R29,R55,R56 and R38. I saw R56 when I first looked and thought where are the other 55 going to fit. :o edit: I see now that the numbers match the schematic. :P

I can understand why a standalone multiport mid router would be great. However since the GM5 will only work with the USB connected, you are limited to using this device while it's connected to a PC. Wouldn't it be easier to just do all the monitoring and merging inside your DAW?

Awesome, great work on this one Ken Bruce....uhh I mean wilba

Does the cutoff frequency track 1v/Oct?

Put me down for a full kit with PICs..thanks ---widdly

Thanks for the replies. For bipolar , around +/- 5v sounds reasonable. I usually find that in a modular there is too much CV rather than too little. I'll post here when I get this built.

I'm not sure the steps would be bigger. AFAIC, the opamps are amplifying the voltage from the DAC. The gain of the opamp is defined by the resistor ratio. For the first CV it will be 1 + R1/(R9 + P1)..which is between 1 + 27k/(15k + 5k) = 2.35 and 1 + 27k/15k = 2.8 times the output voltage from the DAC. It's the bipolar section that I don't quite follow. I imagine the resistors here might need changing if the supply voltage is higher but I don't quite follow how it works. Anyway I can always use a couple of 12v regulators but it would nice if I could swap resistors instead.

Can anyone see any potential problems running the AOUT NG from a +/-15v supply? The TL074's can cope with a supply up to +-18volts so they should be fine. I imagine the calibration would be the same for either supply voltage.

I was thinking if you used an ON/ON/ON toggle switch for the power then power off would be in the center, Up would be MB FM and Down would be MB CV. Much faster than reprogramming and ensures that the power goes down before the PIC's are switched. I'm still in the planning stages but I'll post up if I get it working.

Some of the DX7 6 operator algorithms could be translated to 4 operator on one channel and 2 operators on another channel. Not really going to work very well. I'd say the Yamaha Tx81z would be the better match. It has the same wave shapes as the Opl3. I've written a yamaha DX7 sysex translator for a VSTi once and it's not that hard. You will need to download the Sysex data sheets and some example sysex files for the Tx81z and start looking at the sysex file in a Hex editor to get a handle on how they are put together. Start by doing a few parameters only, the patch name is a good place to start.

Can you piggyback the PIC chips in a Midibox? I want to build an Midibox FM with an AOUT module that can be switched to operate as MidiboxCV. The idea is that two PIC chips are mounted on top of each other and the power supply leg of each PIC chip is not soldered to the PCB but connected to a front panel switch so that only one PIC is connected to the PS at once. Like what they have done here.... http://www.nerd-out.com/darrenk/500W/DualBoot_piggyback.htm I'm thinking that the bankstick might need to be switched as well. Would this work?

Congrats Lyle. Looking forward to seeing the photos and docs on this one. On a related note I found this page about a PIC controlled mixed using LM1973 chipos which are three channel digital pots. They are using op-amps for output buffering. The interesting part is the way the LM1973 could be daisy chained so one basic pcb could be designed and then any number of these pcb's could be connected to create the desired number of channels http://www.andrewkilpatrick.org/mind/ir_mixer/

I've got a digitech jamman pedal (http://www.digitech.com/products/JamMan/JamMan.htm). I use it record guitar loops and jam over the top of them. Unfortunately it doesn't have a midi port or clock signal so I can't automatically sync it to other equipment. It does however have an led that flashes for each beat. My idea is to stick a photo diode or an LDR onto the flashing led and feed it to a digital input on a MB core. Alternatively I could connect a diode and a plug in parallel with the LED inside the Jamman and use this to connect to the digital input on the core. In the core I could write an application to measure the time between each pulse, divide it by 24 and then use that value to send the midi clock messages. I could program the core to start and stop the clock in response to another digital input connected to a foot switch. I think the software shouldn't be too much trouble since I've done a lot of c coding before and I should be able to reuse much of the midiclock application the TK has written. I'm more concerned with a good way of getting from the flashing led on jamman into a digital signal on the core. Any ideas? Do you think this would work?

All current stock is gone. I post again if I can get some more. Ron I posted yours a little over a week ago, they should arrive soon. cheers.

I've got some NOS. 1-ymf262 and 2-yac 512 for $15 USD the lot including delivery. Message me for details.

Yeah that's $15 USD delivered anywhere in the world....which I'm pretty sure includes Germany ;) Send me a message if you are interested.

With those scale charts I'm not sure the force to scale is correct. For example... C Major has C D E F G A B C. I would expect C#, which is a minor second should be transposed to a major second which would be D. Likewise I'd expect the D# to be forced to E since D# is a minor third. Same with the 6th and 7th. Something like.... ;; 0 1 2 3 4 5 6 7 8 9 10 11 ;; C C# D D# E F F# G G# A A# B SCALE_ENTRY 0, 2, 2, 4,4,5,5,7,9,9,11,11 ; Major

6 sets still available. $15 USD for all the SMD parts required for a Midibox FM PCB (YMF262 and 2 x YAC512).

Selling as a complete set, 1 x YMF262m and 2 x YAC512 new old stock. $15 USD delivered. 8 sets available. Thanks