additional library collection for cl-collider

sc-extensions

# sc-extensions

Additional library collection for <a href="https://github.com/byulparan/cl-collider">cl-collider</a> .   
this include server-side-sequencing tool / alias ugens 
and it implements `pc` library from Andrew Sorensen's [Extempore](http://digego.github.io/extempore/index.html)  

## Usage:

```cl
;;; load on cl-collider and sc-extensions
(ql:quickload '(:cl-collider :sc-extensions))

(in-package :sc-user)
(use-package :sc-extensions)
(named-readtables:in-readtable :sc)

;;; bootup server
(setf *s* (make-external-server "Lisp-collider" :port 57880))
(server-boot *s*)

;;; set bpm
(bpm 60.0)
(server-query-all-nodes) ;; You can look nodes state on scsynth server

;; run synth
(proxy :foo
  (pan2.ar (sin-osc.ar 440 0 (env-gen.kr (perc .0 .4 .2) :gate (tr 4)))))  ;; trigger on every 1/16 beat


;;; change note and beat
(proxy :foo
  (pan2.ar (sin-osc.ar (midicps (t-choose.kr (tr 4) [60 67 71 72])) 0
                       (env-gen.kr (perc .0 .4 .2) :gate (tr 8)))))


;;; chord progression every 4 beat 
(proxy :foo
  (pan2.ar (mix (sin-osc.ar (midicps (sel-pos.kr .25 [(pc:make-chord 40 80 4 (pc:diatonic 0 :^ :i7))
						      (pc:make-chord 40 80 4 (pc:diatonic 0 :^ :vi7))]))
			    0 (env-gen.kr (perc .0 .4 .2) :gate (tr 8))))))

;;; modified to gate
(proxy :foo
  (let* ((gate (g+ 4 8 [0 3 6])))
    (pan2.ar (mix (sin-osc.ar (midicps (sel-pos.kr .25 [(pc:make-chord 40 80 4 (pc:diatonic 0 :^ :i7))
						        (pc:make-chord 40 80 4 (pc:diatonic 0 :^ :vi7))]))
			      0 (env-gen.kr (perc .0 .4 .2) :gate gate))))))

;;; change bpm
(bpm 72.0)

;;; change bpm with lag time
(bpm 88.0 :lag 8.0)

;;; grid base sequencing
(proxy :foo
  (with-grid (4 8)
      ((gt [0 3 6])
       (note [60 67 71])
       (decay [.4 1.0 .2]))
    (pan2.ar (sin-osc.ar (midicps note) 0
			 (env-gen.kr (perc .0 decay .2) :gate gt)))))

;;; polyphonic grid
(proxy :foo
  (with-grid-poly (4 8)
      ((gt [0 3 6])
       (note [60 67 71]))
    (pan2.ar (mix (sin-osc.ar (midicps note) 0
			      (env-gen.kr (perc .0 2.0 .2) :gate gt))))))
```


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sc-extensions

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