;Written by Iain McCurdy, 2006 -odevaudio -b400 sr = 44100 ;SAMPLE RATE kr = 441 ;CONTROL RATE ksmps = 100 ;NUMBER OF AUDIO SAMPLES IN EACH CONTROL CYCLE nchnls = 2 ;NUMBER OF CHANNELS (2=STEREO) ;FLTK INTERFACE CODE;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;; FLcolor 255, 255, 255, 0, 0, 0 ;SET INTERFACE COLOURS ; LABEL | WIDTH | HEIGHT | X | Y FLpanel "tone", 500, 150, 0, 0 ;SWITCHES ON | OFF | TYPE | WIDTH | HEIGHT | X | Y | OPCODE | INS | STARTTIM | IDUR gkOnOff,ihOnOff FLbutton "On/Off", 1, 0, 22, 150, 25, 5, 5, 0, 1, 0, -1 FLsetColor2 255, 255, 50, ihOnOff ;SET SECONDARY COLOUR TO YELLOW ;VALUE DISPLAY BOXES LABEL | WIDTH | HEIGHT | X | Y idhp FLvalue " ", 100, 20, 5, 75 idgain FLvalue " ", 70, 20, 5, 125 ;COUNTERS MIN | MAX | STEP1 | STEP2 | TYPE | WIDTH | HEIGHT | X | Y | OPCODE gkskip, ihskip FLcount "Initialisation 0-On 1-Off", 0, 1, 1, 1, 2, 150, 25, 345, 5, -1 ;SLIDERS MIN | MAX | EXP | TYPE | DISP | WIDTH | HEIGHT | X | Y gkhp, ihhp FLslider "Filter Cutoff", 20, 20000, -1, 23, idhp, 490, 25, 5, 50 gkgain, ihgain FLslider "Output Amplitude Scaling", 0, 2, 0, 23, idgain, 490, 25, 5, 100 ;SET INITIAL VALUES OF FLTK VALUATORS ; VALUE | HANDLE FLsetVal_i 20000, ihhp FLsetVal_i 1, ihgain FLpanel_end ;INSTRUCTIONS AND INFO PANEL FLpanel " ", 500, 220, 512, 0 ;TEXT BOXES TYPE | FONT | SIZE | WIDTH | HEIGHT | X | Y ih FLbox " tone ", 1, 5, 14, 490, 15, 5, 0 ih FLbox "-------------------------------------------------------------", 1, 5, 14, 490, 15, 5, 20 ih FLbox "tone is an implementation of a first-order recursive low-pass", 1, 5, 14, 490, 15, 5, 40 ih FLbox "filter Its input arguments are for cutoff frequency (half- ", 1, 5, 14, 490, 15, 5, 60 ih FLbox "-power point) and a 2-way switch selecting whether the data ", 1, 5, 14, 490, 15, 5, 80 ih FLbox "space for feedback within the filter is initially cleared or ", 1, 5, 14, 490, 15, 5, 100 ih FLbox "allowed to retain previously held information. ", 1, 5, 14, 490, 15, 5, 120 ih FLbox "As its name suggests, the audible effect of the tone opcode ", 1, 5, 14, 490, 15, 5, 140 ih FLbox "on an audio signal is similar to that of a tone control. ", 1, 5, 14, 490, 15, 5, 160 ih FLbox "Multiple iterations of the tone opcode applied to the signal ", 1, 5, 14, 490, 15, 5, 180 ih FLbox "path in series can be used to create a sharper cutoff curve. ", 1, 5, 14, 490, 15, 5, 200 FLpanel_end FLrun ;RUN THE FLTK WIDGET THREAD ;END OF FLTK INTERFACE CODE;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;; instr 1 if gkOnOff=0 then ;IF On/Off SWITCH IS SET TO 'OFF'... turnoff ;TURN THIS INSTRUMENT OFF endif ;END OF CONDITIONAL BRANCHING kporttime linseg 0,0.001,0.005,1,0.005 ;CREATE A VARIABLE FUNCTION THAT RAPIDLY RAMPS UP TO A SET VALUE khp portk gkhp, kporttime ;SMOOTH MOVEMENT OF SLIDER VARIABLE ;OUTPUTS OPCODE FILE | SPEED | INSKIP | LOOPING (0=OFF 1=ON) asigL, asigR diskin2 "Seashore.wav", 1, 0, 1 ;GENERATE 2 AUDIO SIGNALS FROM A STEREO SOUND FILE (NOTE THE USE OF GLOBAL VARIABLES) kSwitch changed gkskip ;GENERATE A MOMENTARY '1' PULSE IN OUTPUT 'kSwitch' IF ANY OF THE SCANNED INPUT VARIABLES CHANGE. (OUTPUT 'kSwitch' IS NORMALLY ZERO) if kSwitch=1 then ;IF I-RATE VARIABLE CHANGE TRIGGER IS '1'... reinit START ;BEGIN A REINITIALISATION PASS FROM LABEL 'START' endif START: aresL tone asigL, khp, i(gkskip) aresR tone asigR, khp, i(gkskip) rireturn ;RETURN FROM REINITIALISATION PASS TO PERFORMANCE TIME PASSES outs aresL * gkgain, aresR * gkgain ;SEND FILTER OUTPUT TO THE AUDIO OUTPUTS, RESCALE USING SLIDER VARIABLE gkgain endin f 0 3600 ;DUMMY SCORE EVENT ALLOWS REAL-TIME PERFORMANCE FOR 1 HOUR