Synths - add missing amp/pan varlag ugens for sc808 cowbell

Author: samaaron

etc/synthdefs/compiled/sonic-pi-sc808_cowbell.scsyndef

@@ -444,6 +444,9 @@ SynthDef('sonic-pi-sc808_cowbell', {|
   note2 = note2.midicps;
   hpf = hpf.midicps;
   lpf = lpf.midicps;
+  amp = amp.varlag(amp_slide, amp_slide_curve, amp_slide_shape);
+  pan = pan.varlag(pan_slide, pan_slide_curve, pan_slide_shape);
+
   hpf = hpf.varlag(hpf_slide, hpf_slide_curve, hpf_slide_shape);
   lpf = lpf.varlag(lpf_slide, lpf_slide_curve, lpf_slide_shape);