Jagernot

Livecoding with din

din has a Tcl / Tk interpreter for livecoding sound and GUI. Tcl/Tk is a convenient choice for livecoding in din because both din and Tcl/Tk commands have the form:

command_name arg1 arg2 ... argN

You can mix din commands with Tcl/Tk commands, take advantage of powerful dynamic programming features of Tcl, GUI widgets of Tk but most importantly code while din is running.

an example:

# code snippets we will execute to change different sound parameters in din.

set code1 {set_bpm fm $v; set_bpm gate-l $v; set_bpm gate-r $v} ;# changes FM bpm and gater L and gater R bpm.
set code2 {key $v} ;# changes key of din. $v is value in Hz. 
set code3 {set_delay all feedback [expr $v/100.0]} ;# changes feedback of L and R delay lines

# set_bpm, key and set_delay are built-in din commands.

# make a Tk based slider

package require Tk;

scale .s ;# slider is called scale in Tk.
grid .s

# slider will now show up in a window

# slider handler
proc slide {code v} { 
  eval $code ;# evaluate code snippet when you move the slider knob.
}

# change FM bpm and gater L and R bpm.
set code $code1
.s configure -from 0 -to 240 -command {slide $code}

# change key of din
set code $code2
.s configure -from 261 -to [expr 4*261] ;# slider range from middle C to 2 octaves above middle-C

# change feedback on all delays
set code $code3
.s configure -from 0 -to 100 ;# slider range from 0 to 100