Rhythmic Curve between defined values

[Veit]

How do I create a rhythm that accelerates or slows down between defined rhythmic values?

For example: A constant rhythm of repeated 1/136 notes should gradually slow down until it reaches 1/88. This should really be achieved with note values, not with tempo changes.

[erka]

Maybe like this .That is the first that came to mind. Probably a better way.

(setf ll (gen-integer 144 88))

(make-omn 
:pitch  '(c4 ) 
:length   (loop for i in ll collect (/ 1 i))
)
;; result is this:
'(1/144 c4 mf 1/143 1/142 1/141 1/140 1/139 1/138 1/137 1/136 1/135 1/134 1/133 1/132 1/131 1/130 1/129 u 1/127 1/126 1/125 1/124 1/123 1/122 1/121 1/120 1/119 1/118 1/117 1/116 1/115 1/114 1/113 1/112 1/111 1/110 1/109 1/108 1/107 1/106 1/105 1/104 1/103 1/102 1/101 1/100 1/99 1/98 1/97 1/96 1/95 1/94 1/93 1/92 1/91 1/90 1/89 1/88)

But I get this error  when I try to get notation with cmd-1 :

 

OM 40 > audition-musicxml-omn-snippet

Error: Failed to create interface #<om-capi::notation-view "Notation Viewer: Snippet [10]" 812054F143> in its process #<mp:process Name "Cocoa Event Loop" Priority 70000000 State "Running (inside foreign code)">. Errors during display:  
 -->> The value 3217 of cl-midi::numer inside CL-MIDI:MAKE-TIME-SIGNATURE-EVENT is not of type (unsigned-byte 8). 

 

The values are ratios that should be valid.I tried several  by themselves and they show in notation.

Any idea?

[opmo]

This can't be displayed in notation. How do you display 1/139 etc...

 

(setf step 8)
(setf den (gen-integer 144 88 step))
=> (144 136 128 120 112 104 96 88)

(loop for i in den
      collect (/ 1 i))
=> (1/144 1/136 1/128 1/120 1/112 1/104 1/96 1/88)

 

This ratios making no sense in notation, this is why we use tempo changes - rit. and accel.

[erka]

I assume your example was a working example.

It also throws an error on cmd-1 on my Mac(Sonoma) newest Opusmodus.

In case it is working on your system I can send a bug report.

 

I tried the following:

'( 1/139 c5 1/99)

'( 1/139 c5 1/101)

'( 1/139 c5 1/101 1/99)


(setf step 1)
(setf den (gen-integer 144  2 step))

(setf xx (make-omn 
:pitch  '(c4 ) 
:length   (loop for i in den collect (/ 1 i))
))

(single-events xx)

The first 2 lines are shown in notation . The third throws error.

For xx: midi and audition  works. Notation throws error.

(single-events xx) shows all length in notation and plays them.

 

The problem seems not to be that the length can't be displayed but calculating the beat I guess.