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Paul, I can help you with the midi value -> tempo adjustment numbers, but I'll need to do a little some research into how tempo adjustments map into pitch shifting. But, my numbers don't seem to match your trial and error numbers, where a tempo change of 0 should result in no pitch shifting. My numbers show 'no pitch shift' to be around 42 or 43, not 76 as you suggested. Please find enclosed a text file listing your midi->tempo mapping. peace -cpr >-- Original Message -- >Date: Thu, 6 Nov 2003 20:28:50 +0000 >Subject: BPM & Pitch Shift on Repeater >From: Paul Greenstein <paul@ubiq.co.uk> >To: loopers-Delight@loopers-delight.com >Reply-To: Loopers-Delight@loopers-delight.com > > >Being a mathematical dunce, I'm having difficulty working out the >relationship between midi controller values and tempo/pitch shift. > >The manual says: > >(using cc 14) (-75%+150%) adjusts the tempo and pitch as a percentage >of the current tempo. 76 is zero shift. > >I've made this work via trial and error - for example, a value of 25 >seems to reduce the pitch by -12 , but it would be nice to be able to >predict the relative tempo change as well... > >Maybe someone out there knows what I'm on about... > > > > >Paul >
Tempo Adjustment = (MidiValue * 1.77) - 75 Midi Value = 0 -> Tempo Adjustment = %-75 Midi Value = 1 -> Tempo Adjustment = %-74 Midi Value = 2 -> Tempo Adjustment = %-72 Midi Value = 3 -> Tempo Adjustment = %-70 Midi Value = 4 -> Tempo Adjustment = %-68 Midi Value = 5 -> Tempo Adjustment = %-67 Midi Value = 6 -> Tempo Adjustment = %-65 Midi Value = 7 -> Tempo Adjustment = %-63 Midi Value = 8 -> Tempo Adjustment = %-61 Midi Value = 9 -> Tempo Adjustment = %-60 Midi Value = 10 -> Tempo Adjustment = %-58 Midi Value = 11 -> Tempo Adjustment = %-56 Midi Value = 12 -> Tempo Adjustment = %-54 Midi Value = 13 -> Tempo Adjustment = %-52 Midi Value = 14 -> Tempo Adjustment = %-51 Midi Value = 15 -> Tempo Adjustment = %-49 Midi Value = 16 -> Tempo Adjustment = %-47 Midi Value = 17 -> Tempo Adjustment = %-45 Midi Value = 18 -> Tempo Adjustment = %-44 Midi Value = 19 -> Tempo Adjustment = %-42 Midi Value = 20 -> Tempo Adjustment = %-40 Midi Value = 21 -> Tempo Adjustment = %-38 Midi Value = 22 -> Tempo Adjustment = %-37 Midi Value = 23 -> Tempo Adjustment = %-35 Midi Value = 24 -> Tempo Adjustment = %-33 Midi Value = 25 -> Tempo Adjustment = %-31 Midi Value = 26 -> Tempo Adjustment = %-29 Midi Value = 27 -> Tempo Adjustment = %-28 Midi Value = 28 -> Tempo Adjustment = %-26 Midi Value = 29 -> Tempo Adjustment = %-24 Midi Value = 30 -> Tempo Adjustment = %-22 Midi Value = 31 -> Tempo Adjustment = %-21 Midi Value = 32 -> Tempo Adjustment = %-19 Midi Value = 33 -> Tempo Adjustment = %-17 Midi Value = 34 -> Tempo Adjustment = %-15 Midi Value = 35 -> Tempo Adjustment = %-14 Midi Value = 36 -> Tempo Adjustment = %-12 Midi Value = 37 -> Tempo Adjustment = %-10 Midi Value = 38 -> Tempo Adjustment = %-8 Midi Value = 39 -> Tempo Adjustment = %-6 Midi Value = 40 -> Tempo Adjustment = %-5 Midi Value = 41 -> Tempo Adjustment = %-3 Midi Value = 42 -> Tempo Adjustment = %-1 Midi Value = 43 -> Tempo Adjustment = %1 Midi Value = 44 -> Tempo Adjustment = %2 Midi Value = 45 -> Tempo Adjustment = %4 Midi Value = 46 -> Tempo Adjustment = %6 Midi Value = 47 -> Tempo Adjustment = %8 Midi Value = 48 -> Tempo Adjustment = %9 Midi Value = 49 -> Tempo Adjustment = %11 Midi Value = 50 -> Tempo Adjustment = %13 Midi Value = 51 -> Tempo Adjustment = %15 Midi Value = 52 -> Tempo Adjustment = %17 Midi Value = 53 -> Tempo Adjustment = %18 Midi Value = 54 -> Tempo Adjustment = %20 Midi Value = 55 -> Tempo Adjustment = %22 Midi Value = 56 -> Tempo Adjustment = %24 Midi Value = 57 -> Tempo Adjustment = %25 Midi Value = 58 -> Tempo Adjustment = %27 Midi Value = 59 -> Tempo Adjustment = %29 Midi Value = 60 -> Tempo Adjustment = %31 Midi Value = 61 -> Tempo Adjustment = %32 Midi Value = 62 -> Tempo Adjustment = %34 Midi Value = 63 -> Tempo Adjustment = %36 Midi Value = 64 -> Tempo Adjustment = %38 Midi Value = 65 -> Tempo Adjustment = %40 Midi Value = 66 -> Tempo Adjustment = %41 Midi Value = 67 -> Tempo Adjustment = %43 Midi Value = 68 -> Tempo Adjustment = %45 Midi Value = 69 -> Tempo Adjustment = %47 Midi Value = 70 -> Tempo Adjustment = %48 Midi Value = 71 -> Tempo Adjustment = %50 Midi Value = 72 -> Tempo Adjustment = %52 Midi Value = 73 -> Tempo Adjustment = %54 Midi Value = 74 -> Tempo Adjustment = %55 Midi Value = 75 -> Tempo Adjustment = %57 Midi Value = 76 -> Tempo Adjustment = %59 Midi Value = 77 -> Tempo Adjustment = %61 Midi Value = 78 -> Tempo Adjustment = %63 Midi Value = 79 -> Tempo Adjustment = %64 Midi Value = 80 -> Tempo Adjustment = %66 Midi Value = 81 -> Tempo Adjustment = %68 Midi Value = 82 -> Tempo Adjustment = %70 Midi Value = 83 -> Tempo Adjustment = %71 Midi Value = 84 -> Tempo Adjustment = %73 Midi Value = 85 -> Tempo Adjustment = %75 Midi Value = 86 -> Tempo Adjustment = %77 Midi Value = 87 -> Tempo Adjustment = %78 Midi Value = 88 -> Tempo Adjustment = %80 Midi Value = 89 -> Tempo Adjustment = %82 Midi Value = 90 -> Tempo Adjustment = %84 Midi Value = 91 -> Tempo Adjustment = %86 Midi Value = 92 -> Tempo Adjustment = %87 Midi Value = 93 -> Tempo Adjustment = %89 Midi Value = 94 -> Tempo Adjustment = %91 Midi Value = 95 -> Tempo Adjustment = %93 Midi Value = 96 -> Tempo Adjustment = %94 Midi Value = 97 -> Tempo Adjustment = %96 Midi Value = 98 -> Tempo Adjustment = %98 Midi Value = 99 -> Tempo Adjustment = %100 Midi Value = 100 -> Tempo Adjustment = %102 Midi Value = 101 -> Tempo Adjustment = %103 Midi Value = 102 -> Tempo Adjustment = %105 Midi Value = 103 -> Tempo Adjustment = %107 Midi Value = 104 -> Tempo Adjustment = %109 Midi Value = 105 -> Tempo Adjustment = %110 Midi Value = 106 -> Tempo Adjustment = %112 Midi Value = 107 -> Tempo Adjustment = %114 Midi Value = 108 -> Tempo Adjustment = %116 Midi Value = 109 -> Tempo Adjustment = %117 Midi Value = 110 -> Tempo Adjustment = %119 Midi Value = 111 -> Tempo Adjustment = %121 Midi Value = 112 -> Tempo Adjustment = %123 Midi Value = 113 -> Tempo Adjustment = %125 Midi Value = 114 -> Tempo Adjustment = %126 Midi Value = 115 -> Tempo Adjustment = %128 Midi Value = 116 -> Tempo Adjustment = %130 Midi Value = 117 -> Tempo Adjustment = %132 Midi Value = 118 -> Tempo Adjustment = %133 Midi Value = 119 -> Tempo Adjustment = %135 Midi Value = 120 -> Tempo Adjustment = %137 Midi Value = 121 -> Tempo Adjustment = %139 Midi Value = 122 -> Tempo Adjustment = %140 Midi Value = 123 -> Tempo Adjustment = %142 Midi Value = 124 -> Tempo Adjustment = %144 Midi Value = 125 -> Tempo Adjustment = %146 Midi Value = 126 -> Tempo Adjustment = %148 Midi Value = 127 -> Tempo Adjustment = %149