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Topic: Wersi miditronic midi implementation (Read 3667 times) |
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kwissbeats
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MIDI-OX Rules!
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Wersi miditronic midi implementation
« on: Nov 10th, 2016, 3:01pm » |
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Hey there!
I've got this obsecure German midi keyboard for nothing from a friend who never use it.
It's a Wersi miditronic 88, it's velocity sensitife and got really nice keys.
But when I'm recording in fl studio I see that there are some really tiny notes, that should not be there.
So thanks to google I found U guys,
I Installed midi ox and I am looking at the monitor data right now.
It seems that it sends a note off command prior to the note on command. and sends a note on command after releasing
(pressing a single key once)
to me that seems quite weird,
is it a legacy thing? is there a way arround? 
or is it normal behavior?
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| « Last Edit: Nov 10th, 2016, 3:04pm by kwissbeats » |
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Breath
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Re: Wersi miditronic midi implementation
« Reply #1 on: Nov 11th, 2016, 11:41pm » |
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Hi and welcome.
Wersi has been making organs for years, but I have not heard of the Miditronic88.
Most keyboards have contact switches beneath the keys.
If it is a velocity sensitive keyboard (which it looks like yours is) then it needs 2 switches per key so it can measure the time from the first switch to the second.
I think your Wersi keyboard might be a organ type that uses bent wire to make up switches or the older type of synth keyboard where there are three metal contacts, with the middle one being like a 'toungue', that moves with the key.
Either way these three contacts form the double switch.
Here is a damaged Yamaha keyboard - see the bent center contact.
Taken from http://bustedgear.com/repair_Yamaha_Korg_contacts_2.html
When the key is at rest, the middle contact rests against the top contact and clear of the lower one.
When the key is pressed it leaves the upper contact and this breaks a circuit that causes the timing to start.
When middle contact reaches the lower contact that circuit becomes connected and the timing stops.
At this point the keyboard knows the velocity of the key and the MidiNoteOn message should be sent with the velocity (the third number).
On some keyboards the velocity of the release of the key is also measured.
When the key is released the timing is started when the middle contacts breaks the lower circuit and the timing stops when it reaches the top contact.
At this point the release velocity is know and a MidiNoteOff message is sent.
Most switches bounce a bit - making and breaking the circuit. Normally when the computer (controller) in keyboard is programmed they allow for this by reading the state of the switch a few times to make sure it has changed from connected to disconnected or the reverse.
I suspect you are getting a bit of excessive bounce in the contacts due to dirt or wear or both.
I would open it up and clean the contacts where they meet.
Be careful as these contacts on these keyboards are a springy material and can be easily bent and damaged.
If it is a newer type it will have rubber membrane switches with 2 black dots that connect with a printed circuit board.
From the same website.
You can usually carefully pop the strip off the circuit board and clean the contacts on the board and the strip.
The black contacts also wear out and you can try a black (graphite) pencil to re-coat the contact surface on the rubber.
Hope this helps.
Royce
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kwissbeats
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MIDI-OX Rules!
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Re: Wersi miditronic midi implementation
« Reply #2 on: Nov 12th, 2016, 8:43am » |
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that could absolutely be true,
thanks a 100 times, for taking the time to explain all that!
seems I got something to do for the weekend!
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