button presses = +/- keyboard transpose?

MIDIbox NG
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1

Okay so I’m having a bit of trouble figuring out how to take the current keyboard range and on each successive press of a button, shift it down by one octave. It has to be relative, because I also want an increment button as well.

 

I’m assuming it’d be something like:

 

event_button id=1  kb_transpose= current_value + 12

event_button id=2  kb_transpose= current_value - 12

 

Sorry if this has been covered before, (I looked but maybe I didn’t search for the right terms?).  Thanks for any help!

2

Tonedef

 

I happened to read your August post.  

 

I can let you know how I achieved this if you need some ideas.  I use two membrane momentary switches. Transpose+ and Transpose-.

 

If you want to see the code let me know.

 

Robin

3

Sorry I’ve not been on the forums in awhile, but yes! If you’ve got some code to share, I’d love to take a look. I’ve been trying to accomplish this via the NGC file, but haven’t had much luck. I’m currently using the NG app which does everything else I need, just not the keyboard octave shifting… Thanks Robin!

4

Here are a couple of ideas.

 

Most of my work concerns digital piano.

 

In addition to scanning the keys for switch changes . I scan 16 extra switches for changes.  You could use J5 to to the same.

 

I use a membrane momentary action switch.made by MEC with low bounce characteristics.

 

Here is some code for a 2 switch solution. This enables the user to to decrement and increment the value.  You will need to declare the transpose variable as a global variable.

 

//transpose buttons
	if(pin == 95 && pin_value == 0){//pin 95 is RH Transpose Button ie + Transpose (Higher Note)
	transpose = transpose +1;}	
	if(pin == 94 && pin_value == 0){//pin 94 is LH Transpose Button ie + Transpose (Lower Note)
	transpose = transpose -1;}	
	if(transpose > 9){ transpose = 9;}
	if(transpose < -9){transpose = -9;}

 

You need only one switch, but you can only advance

 

if(pin == 95 && pin_value == 0){//pin 95 is Transpose Button 
	transpose = transpose +1;}
if(transpose > 9){ transpose = 0;}

 

In the latter case pressing the button after 9 is reached, returns the variable to 0

 

 

Later in the program you will add the transpose value to the note number..

 

For octave shifts you will use multiples of 12 notes

 

 

 

Robin