[CM] How to fix: no such class MIDIMSG

[Emre Sevinc]

Hi all,

I'm studying Ch. 15 of the book Notes from the Metalevel
and after successfuly listening to harmonic series
I was stuck at Ex. 2, clearbends:

(define (clearbends)
  (process for c below 16
           output (new midimsg 
                    :time (now) 
                    :msg (make-pitch-bend c 0))))

; in: DEFINE (CLEARBENDS)
;     (CM:NEW CM::MIDIMSG :TIME (CM:NOW) :MSG (CM::MAKE-PITCH-BEND CM::C 0))
; 
; caught ERROR:
;   (in macroexpansion of (NEW MIDIMSG :TIME ...))
;   (hint: For more precise location, try *BREAK-ON-SIGNALS*.)
;   There is no class named MIDIMSG.

What does that mean? Is midimsg a deprecated class? Is there
some similar class with a different name? 

I'll be glad if somebody can help me.

Happy musical hacking,
Emre S.
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