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 Forum index » DIY Hardware and Software » Musical Interfaces
Triggering a zoom sampletraks pads by midi-trigger
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Zap



Joined: Jan 11, 2012
Posts: 6
Location: Germany

PostPosted: Wed Jan 11, 2012 11:48 am    Post subject: Triggering a zoom sampletraks pads by midi-trigger
Subject description: looking for hints where to start
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Hi guys,
i'm new to hardware modifications and until now have not much skills in electronics (besides some soldering experience) and would like to get some hints where to start my quest:
I'm looking for a solution to add midi triggering of the pad actions of a zoom sampletrack.
The sampletrack lacks the midi spec to trigger songs, but it is possible on the hardware itself using the pads on the machine.

Can anyone give me some starting points what i could do to analyse signals, find the right spots for wireing some triggers and midi/trigger hardware which could be suitable for such a task ?


Appreciate your help.

Best Regards,
Zap
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PickNick



Joined: Oct 16, 2009
Posts: 82
Location: BP

PostPosted: Tue Jan 24, 2012 5:38 pm    Post subject: Reply with quote  Mark this post and the followings unread

hi Zap!
welcome on EM!
if there is no any option...
you can add some extras:)

http://www.ucapps.de/mbhp_core.html
you should buy some premade PCBs and
preprogrammed PICs from
http://mbhp.avishowtech.com/buy.html
or this
http://www.vacoloco.net/synths/midi2sds/
or...
http://www.engineersatwork.nl/dtronics/pages/midi_to_trigger_interface.html

this modules convert the Midi Notes to Trigger
/a narrow pulse signal

than you need a circuit like V trigger to S trigger.
http://www.retrosynth.com/docs/trigger/triggermod.gif

after you have to find the right points in your Zoom
where those switches connected
/if you are not sure use DMM/,
add the V trigg to S trigg circuit to this points,
don't mess the original switch .
you can add some small jack connectors to your Zoom
if there is enough space.
i hope this help!
p

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Zap



Joined: Jan 11, 2012
Posts: 6
Location: Germany

PostPosted: Wed Jan 25, 2012 2:44 pm    Post subject: Reply with quote  Mark this post and the followings unread

Hi PickNick !
Great to get an answer, thank you very much for your hints.
I even can by the Midi-trigger here in Germany from:
http://www.touched-by-sound.com/de/Keyboards-39704-Dtronics_MTrig_V2_Midi_to_Trigger_interface.html

So if i understand right, this will create some kind of voltage peak signal that has to be converted to a short circuit (which is what the pads actually do) ?

What i really like about that is that it doesn't cost much money, so i will definitely give it a try (if i found out where to connect the swiches ...)

Many thanx,
Zap
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PickNick



Joined: Oct 16, 2009
Posts: 82
Location: BP

PostPosted: Thu Jan 26, 2012 9:20 am    Post subject: Reply with quote  Mark this post and the followings unread

So if i understand right, this will create some kind of voltage peak signal that has to be converted to a short circuit (which is what the pads actually do) ?

yes. this converters are usefull to triggering analog drum modules, EGs...
some old synths works with S trigger/switch and some of them with V trigger/voltage.

sometimes these buttons made from the PCB traces///there is no real switch
and they put some conductive materials to the plastic pad.
its a cheaper way.
this is why these switches stop to working if there is some dirt between the
two surface.

http://www.openmusiclabs.com/wp/wp-content/uploads/2011/10/keyboard_button_med.jpg

if your Zoom have this kind of switch than you have to find those two traces on the PCB.

good luck!
p

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Zap



Joined: Jan 11, 2012
Posts: 6
Location: Germany

PostPosted: Fri Jan 27, 2012 2:41 pm    Post subject: Reply with quote  Mark this post and the followings unread

The contacts in the zoom are working just this way (but with a bigger surface area and a snake like contact on the pcb). But there are no nice places to solder some wires to. I will have a look whats going on at the connector going from the pads pcb to the main pcb.

btw: do you by chance know which latency the aforementioned midi-trigger interface has ?

Would somethink like an alesis trigger i/o also work to do this job ?

Cheers,
Stephan
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Antimon



Joined: Jan 18, 2005
Posts: 3708
Location: Sweden
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PostPosted: Fri Jan 27, 2012 4:07 pm    Post subject: Reply with quote  Mark this post and the followings unread

Just want to say that you have an awesome Paradroid avatar, PickNick!

Ignore me and carry on...

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PickNick



Joined: Oct 16, 2009
Posts: 82
Location: BP

PostPosted: Sun Jan 29, 2012 2:43 am    Post subject: Reply with quote  Mark this post and the followings unread

woow!
thx Antimon:)

Zap!
i think there is no notable latency, because these are using
really fast microcontrollers.

you mean this?
http://www.alesis.com/triggerio

$159.00...hmmm
its quite a lot of money...

i found this german site:
http://www.mikes-elektronikseite.de/mshop_deutsch/

they are selling Midibox pcbs, kits, parts etc...
i built few of them///Midi2CV, SID synth, Midicontroller, MidiSequencer,
and so far these are the best open source Midi Modular heaven:)
if you buy a midicore+dout4, than you get 64 trigger outs!
don't waste your money for buying some good looking toys!
buy some electronic parts and you can learn a lot!
DIY...this is why you are here:)
p

sorry for my poor english...speak english or DIY:)
http://www.youtube.com/watch?v=o7rpVRnuAcQ

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Zap



Joined: Jan 11, 2012
Posts: 6
Location: Germany

PostPosted: Sat Feb 04, 2012 4:12 pm    Post subject: Reply with quote  Mark this post and the followings unread

Hi PickNick!

Found some connector on the sampletraks pcb, where shortcircuting each of the wires with some other places on the pcb will trigger the different pads.
So i think i can proceed ...
Is there also something like http://www.engineersatwork.nl/dtronics/pages/midi_to_trigger_interface.html which also can gate ? midi note on/off = push/release pad ?

Thank you so much for your help,
Zap
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PickNick



Joined: Oct 16, 2009
Posts: 82
Location: BP

PostPosted: Sun Feb 05, 2012 6:27 am    Post subject: Reply with quote  Mark this post and the followings unread

Hi Zap!

Quote:
Found some connector on the sampletraks pcb, where shortcircuting each of the wires with some other places on the pcb will trigger the different pads.
So i think i can proceed ...


zuppa!

Quote:
Is there also something like http://www.engineersatwork.nl/dtronics/pages/midi_to_trigger_interface.html which also can gate ? midi note on/off = push/release pad ?


Has 23 trigger outputs ( 5 volt positive puls, selectable 1ms or 10ms per pulse )...
there is no gate, just a trigger which can be 1ms or 10ms long.
imagine a piano roll... the trigger outs from c2 to a#3.
doesn't matter how long you hold a key, the midi2trigger will send just a pulse on the midi note on. for release pads you need a logical circuit which is
acting like a switch. than you can make some "gate" between two triggers. the first trigger will switch to hi the second will switch to low the circuit.
soon i will send some schematics or links...but now i have to open my laptop PSU with a saw...aaargghhh

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Zap



Joined: Jan 11, 2012
Posts: 6
Location: Germany

PostPosted: Sun Feb 05, 2012 9:57 am    Post subject: Reply with quote  Mark this post and the followings unread

Hi PickNick

Shocked Dont hurt yourself Shocked
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PickNick



Joined: Oct 16, 2009
Posts: 82
Location: BP

PostPosted: Sun Feb 05, 2012 2:05 pm    Post subject: Reply with quote  Mark this post and the followings unread

no...never again:)
i still have some wires in my knee:)

einige gute Ideen:
http://www.geofex.com/article_folders/cd4053/cd4053.htm

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Zap



Joined: Jan 11, 2012
Posts: 6
Location: Germany

PostPosted: Mon Feb 06, 2012 2:39 pm    Post subject: Reply with quote  Mark this post and the followings unread

Hi,
i have a Doepfer MCV1 lying around here, which can be set to switch-trigger Wink
It has only one trigger out, but this way i can test if it will work Wink

Would like to have one of those:
http://www.cykong.com/Synths/Doepfer%20MCV8/Doepfer-MCV8.htm

Cheers,
Stephan
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