Adjust button Value depending on value of other button?

Question

Dear People,

I am a recent adoptee and i am working on making a full scale layout for my Roland D50, using Sysex and elbow grease. I have hit a snag, which requires me to quickly explain the workings of the D50 sound engine for it to make sense.

A sound in the D50 is built out of 2 layers, each containing 2 partials. These can be muted/unmuted using sysex, but the muting of the 2 partials happens with ONE sysex string value. So: on the upper layer, the string is:

F0 41 00 14 12

00

01

2E

VAL CHK F7

 

Where the VAL is between 0 and 3:

0: Both partials off

1: Partial 1 on, partial 2 off

2: Partial 1 off, partial 2 on

3: both partials on

Now, i want to make a layout where i can have a mute/unmute button for each partial. This would require the buttons to alter their value output based on the value of the other partial button. (e.g. If partial 1 is off, and i want to turn on partial 2, the value when i press the button for Partial 2 has to be '2'. If Partial 1 is off, it has to be '3'.)

Is there any way to do this? The only workaround i know is making a knob that lets me select one of the 4 values and label them with named ticks, but it's kind of clumsy.

Being a recent adoptee of mididesigner and not the greatest mathematical mind in the world, i hope you can help me solve this problem!

Kind regards,

Gerben

Comments

That did the trick, thanks a lot! I don't quite understand what Bit Changers do, but i hope i'll catch on at some point. I believe this is the only parameter on the D50 that works like this, so i should be good from now on. Thanks again!

---

Cool.

Bit Changers are used to solve problems like you faced.

In your case you had 2 buttons. That would mean 2 bits and 4 possible combinations with a range of 0-3.

Value 0 = 00  Both partials are off  
Value 1 = 01  Partial 1 is on ,Partial 2 is off
Value 2 = 10  Partial 2 is on, Partial 1 is off
Value 3  = 11 Both partials are on

In computer programming 0 means off and 1 means on and that's what those Bit Changers do. Each Bit Changer is responsible for turning one bit on and off. So in your case Bit Changer with Change Bits 0 turns on and off your first partial button. Bit Changer with Change Bits 1 turns on and of your second partial button.

Looking forward to your D-50 layout.

Oh, and please give the answer a vote, so that people can find the correct answer should they run into the same problem as you do.

Answer 1

What you need is Bit Changers. Bit Changers have been introduced in Midi Designer version 1.7.

The steps to do:

- Create a knob K with your midi sysex string and midi min-max 0->3
- Create a button called Partial 1.
- Set its Subtype to Bit Changer
- Make Partial 1 button a Super control
- Make knob K sub control of Partial 1 button
- In Midi->Change Bits select 0 from the drop down list.
- Create a button Partial 2
- Set its Subtype to Bit Changer
- Make Partial 2 button a Super control
- Make knob K sub control of Partial 2 button
- In Midi->Change Bits select 1 from the drop down list.
- Set the knob K to hide in performance

Answer 2

What you need is Bit Changers. Bit Changers have been introduced in Midi Designer version 1.7.

The steps to do:

- Create a knob K with your midi sysex string and midi min-max 0->3
- Create a button called Partial 1.
- Set its Subtype to Bit Changer
- Make Partial 1 button a Super control
- Make knob K sub control of Partial 1 button
- In Midi->Change Bits select 0 from the drop down list.
- Create a button Partial 2
- Set its Subtype to Bit Changer
- Make Partial 2 button a Super control
- Make knob K sub control of Partial 2 button
- In Midi->Change Bits select 1 from the drop down list.
- Set the knob K to hide in performance