[robotfunk]

Had a lot of fun last night and stayed up way too late.. Today I turn it on again and notice that I didn't save the sequence correctly. Can anyone tell the exact step by step method for saving/loading?

ie press save - (hold it?) - press group GP - press slot GP - (release save?)

I was amazed at how varied patterns I could get after just entering a bunch of notes, a real inspiration machine!

[robotfunk]

had more fun last night as well, playing my modular analog synth with it
Listen on Soundcloud.com

[glacial23]

I feel like my V4L is really close to working, but for some reason it is not.

MIOS32 and the SEQV4L program are installed on the LPC, and I can connect to it in MIOS Terminal. However, I'm getting no results from any keypresses and rare intermittent flashing from the LEDs if any activity at all on the SEQV4L board. As far as I can tell, my ribbon cables have correct continuity and placement, and J15_S is in the 5V position.

The only thing I can see that might be amiss is that J5A/B's A5, A6, and A7 don't show any signal when I probe them with a scope, whereas A0-A4 show some activity. Is this normal? It persists when swapping the ribbon cables I'm using for J5A and J5B as well, so I don't think it's a cable issue.

I've double-checked all of my soldering and don't see anything amiss on the CORE and SEQV4L boards.

Any suggestions? I'm stumped at the moment.

-Sam

[TK.]

Sorry, I haven't noticed your troubleshooting questions here... is it solved meanwhile?

A new release is available:

MIDIboxSEQ V4L.058
~~~~~~~~~~~~~~~~~~

   o corrected SysEx output for LPC17

Best Regards, Thorsten.

[glacial23]

TK., on 06 April 2012 - 10:28, said:

Sorry, I haven't noticed your troubleshooting questions here... is it solved meanwhile?

No- I haven't had a chance to get back to it since I posted that. I might be able to tomorrow - any suggestions on specific things to look at?

Thanks,
Sam

[TK.]

The circuit is so simple, that it's very likely a connection problem. Since you've a scope, it could be debugged the following way:

First check the Dx outputs of J5A, each output should be strobed for 1 mS with a period of 8 mS. If not -> problem at the core module.
Thereafter check the J5 Dx inputs on the frontpanel. Do you see the same pattern on each pin? If not -> problem with the ribbon cable.

You won't see the same pattern at the collector of the transistors, because they are used in "open collector" mode. But you could connect a 10k resistor between collector and 5V, and then check the pulses on the collector - they should be inverted compared to the input pulse. It makes sense to disconnect J5A/B and J10 for this check to avoid wrong results (which could be caused by a short circuit for example)

Then it's time to check the polarity of the diodes and LEDs. The cathodes are on the right side (see also schematic).

J5A and B should only show a pattern when the LED of the appr. row is enabled, your description matches with my expectation after power-on.

J10 should show pulses (according to the button matrix) when a button is pressed. Check this at the frontpanel and core module side.

Best Regards, Thorsten.

[Labelwhore]

I got my first MB SEQ 4L (of two) up and running this morning. Thanks T.K., Christian, and Smash TV for your efforts. I haven't put this beast in a case yet, but I'm working on a full Ponoko case with sides. I'll share my case design when it's ready.