1declare id "6DJ8 feedback"; // in amp tube ba.selector
2declare name "6DJ8 feedback";
3
4import("stdfaust.lib");
5import("guitarix.lib");
6
7/****************************************************************
8 ** Tube Preamp Emulation stage 1 - 2
9 */
10
11val(x) = valve.vt(dist, q(x), x)
12with {
13    dist =  40.1;
14    q(x) = lp1tm1(x) * 1 - lp2tm1(x) * 1.02 - 1.0 : clip(-1,-0.01);
15    lp(a) = *(1 - a) : + ~ *(a);
16    lp1tm1 = abs <: lp(0.9999), _ : max;
17    avgs = lp1tm1 : avg;
18    avg_size = ma.SR/9;
19    avg(x) = x - de.delay1s(avg_size,x) : + ~ _ : /(avg_size);
20    lp2tm1 = avgs : lp(0.999);
21};
22
23tubeax(preamp,gain1) =  hgroup("stage1", stage1) :
24          hgroup("stage2", stage2)
25          with {
26
27    atten = 0.6;
28    stage1 = tubestage130_20(TB_6DJ8_68k,86.0,2700.0,1.863946) : - ~ (atten*tubestage130_20(TB_6DJ8_250k,132.0,1500.0,1.271609)) : *(preamp):
29    fi.lowpass(1,6531.0) : tubestage130_20(TB_6DJ8_250k,132.0,1500.0,1.271609): + ~ (atten*tubestage130_20(TB_6DJ8_250k,194.0,820.0,0.797043));
30    stage2 = fi.lowpass(1,6531.0) : tubestage130_20(TB_6DJ8_250k,194.0,820.0,0.797043) : *(gain1);
31
32};
33
34amp = val : component("gxdistortion.dsp").dist1(drive,wet_dry) : tubeax(preamp,gain1) with {
35    drive = ampctrl.drive;
36    wet_dry = ampctrl.wet_dry;
37    preamp = ampctrl.preamp;
38    gain1 = ampctrl.gain1;
39/*
40    drive = vslider(".gxdistortion.drive[alias]",0.35, 0, 1, 0.01);
41    wet_dry = vslider(".gxdistortion.wet_dry[alias]",  100, 0, 100, 1) : /(100) : smoothi(0.999);
42    preamp =  vslider(".amp2.stage1.Pregain[alias]",0,-20,20,0.1) : ba.db2linear : smoothi(0.999);
43    gain1 = vslider(".amp2.stage2.gain1[alias]", 6, -20.0, 20.0, 0.1) : ba.db2linear : smoothi(0.999);
44*/
45};
46
47process = amp,amp;
48