tb() negative values
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tb() negative values
by Neil Thornock
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Hi list,
I'm using tb() to scale my durations. At one point, I'd like to back up from the current start time by a certain number of beats, but it appears tb() can't handle negative values. Is that correct? -- Neil Thornock, D.M. No Stopping, Standing, or Parking: http://neilthornock.net/mp3s/nostopping.mp3 Assistant Professor of Music Composition/Theory Brigham Young University _______________________________________________ RTcmix-discuss mailing list RTcmix-discuss@... http://music.columbia.edu/mailman/listinfo/rtcmix-discuss |
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Re: tb() negative values
by John Gibson
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Hi Neil,
Can you give us a simple score that illustrates this? If your current start time is 10 beats and you want to back up by 4 beats, you would just use tb(6), no? In other words, the tempo mechanism is not aware of where you are in the beat series, beyond what you feed tb(). J On Sep 12, 2011, at 2:48 PM, Neil Thornock <neilthornock@...> wrote: > Hi list, > I'm using tb() to scale my durations. At one point, I'd like to back > up from the current start time by a certain number of beats, but it > appears tb() can't handle negative values. Is that correct? > > -- > Neil Thornock, D.M. > No Stopping, Standing, or Parking: > http://neilthornock.net/mp3s/nostopping.mp3 > Assistant Professor of Music > Composition/Theory > Brigham Young University > _______________________________________________ > RTcmix-discuss mailing list > RTcmix-discuss@... > http://music.columbia.edu/mailman/listinfo/rtcmix-discuss RTcmix-discuss mailing list RTcmix-discuss@... http://music.columbia.edu/mailman/listinfo/rtcmix-discuss |
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Re: tb() negative values
by Neil Thornock
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Hi John,
Yes, this makes sense. In my specific case, I'm using a starttime + tb(increment) approach with a long score-type file. Rather than go through the pain of figuring out the start time at that moment, I'd like to simply back up a few beats. I can work around it with conditionals but had hoped tb() could accept negative values. I see this in the source: 71 float 72 time_beat(float timein) 73 { 74 int m = 0; 75 float durp = 0; 76 77 if (timein < 0.0) 78 timein = 0.0; Right there -- Is there any reason not to accept a negative timein other than that we don't want a negative start time? On Mon, Sep 12, 2011 at 1:07 PM, John Gibson <johgibso@...> wrote: > Hi Neil, > > Can you give us a simple score that illustrates this? > > If your current start time is 10 beats and you want to back up by 4 beats, you would just use tb(6), no? > > In other words, the tempo mechanism is not aware of where you are in the beat series, beyond what you feed tb(). > > J > > On Sep 12, 2011, at 2:48 PM, Neil Thornock <neilthornock@...> wrote: > >> Hi list, >> I'm using tb() to scale my durations. At one point, I'd like to back >> up from the current start time by a certain number of beats, but it >> appears tb() can't handle negative values. Is that correct? >> >> -- >> Neil Thornock, D.M. >> No Stopping, Standing, or Parking: >> http://neilthornock.net/mp3s/nostopping.mp3 >> Assistant Professor of Music >> Composition/Theory >> Brigham Young University >> _______________________________________________ >> RTcmix-discuss mailing list >> RTcmix-discuss@... >> http://music.columbia.edu/mailman/listinfo/rtcmix-discuss > _______________________________________________ > RTcmix-discuss mailing list > RTcmix-discuss@... > http://music.columbia.edu/mailman/listinfo/rtcmix-discuss > -- Neil Thornock, D.M. No Stopping, Standing, or Parking: http://neilthornock.net/mp3s/nostopping.mp3 Assistant Professor of Music Composition/Theory Brigham Young University _______________________________________________ RTcmix-discuss mailing list RTcmix-discuss@... http://music.columbia.edu/mailman/listinfo/rtcmix-discuss |
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Re: tb() negative values
by John Gibson
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Hi Neil,
I don't think this works the way you hope it does. If you ask for tb(increment) where increment is, say .25, that gives you the start time of a 16th note at the very beginning of the tempo curve: it gives you the start time for the 2nd 16th in the first beat. That gives you an accurate duration for a 16th note anywhere in your sequence only if your tempo curve comprises one constant tempo. If your tempo curve has changing tempos, and you are playing a note in the middle of the sequence, this will not give you the right value. The beat values given to tb() are absolute, not relative. So a negative beat value doesn't make sense. J On Sep 12, 2011, at 3:15 PM, Neil Thornock <neilthornock@...> wrote: > Hi John, > Yes, this makes sense. In my specific case, I'm using a starttime + > tb(increment) approach with a long score-type file. Rather than go > through the pain of figuring out the start time at that moment, I'd > like to simply back up a few beats. I can work around it with > conditionals but had hoped tb() could accept negative values. > > I see this in the source: > > 71 float > 72 time_beat(float timein) > 73 { > 74 int m = 0; > 75 float durp = 0; > 76 > 77 if (timein < 0.0) > 78 timein = 0.0; > > Right there -- Is there any reason not to accept a negative timein > other than that we don't want a negative start time? > > On Mon, Sep 12, 2011 at 1:07 PM, John Gibson <johgibso@...> wrote: >> Hi Neil, >> >> Can you give us a simple score that illustrates this? >> >> If your current start time is 10 beats and you want to back up by 4 beats, you would just use tb(6), no? >> >> In other words, the tempo mechanism is not aware of where you are in the beat series, beyond what you feed tb(). >> >> J >> >> On Sep 12, 2011, at 2:48 PM, Neil Thornock <neilthornock@...> wrote: >> >>> Hi list, >>> I'm using tb() to scale my durations. At one point, I'd like to back >>> up from the current start time by a certain number of beats, but it >>> appears tb() can't handle negative values. Is that correct? >>> >>> -- >>> Neil Thornock, D.M. >>> No Stopping, Standing, or Parking: >>> http://neilthornock.net/mp3s/nostopping.mp3 >>> Assistant Professor of Music >>> Composition/Theory >>> Brigham Young University >>> _______________________________________________ >>> RTcmix-discuss mailing list >>> RTcmix-discuss@... >>> http://music.columbia.edu/mailman/listinfo/rtcmix-discuss >> _______________________________________________ >> RTcmix-discuss mailing list >> RTcmix-discuss@... >> http://music.columbia.edu/mailman/listinfo/rtcmix-discuss >> > > > > -- > Neil Thornock, D.M. > No Stopping, Standing, or Parking: > http://neilthornock.net/mp3s/nostopping.mp3 > Assistant Professor of Music > Composition/Theory > Brigham Young University > _______________________________________________ > RTcmix-discuss mailing list > RTcmix-discuss@... > http://music.columbia.edu/mailman/listinfo/rtcmix-discuss RTcmix-discuss mailing list RTcmix-discuss@... http://music.columbia.edu/mailman/listinfo/rtcmix-discuss |
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Re: tb() negative values
by Neil Thornock
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You're right -- I'm not dealing with scaling tempos but rather with
very many (hundreds, maybe thousands) specifically indicated "notes" (anathema to algorithmic music, I know...). So a call to tb() would only be relative to a certain point in time (the current start time of the instrument), not my tempo at that moment. Anyway, the solution was trivial; I perform the math operations *first* and then make my call to tb(). This kind of rigamaroll is what I get for being only an occasional rtcmixer :( Thanks John. Say hi to the crowd for me. On Mon, Sep 12, 2011 at 2:14 PM, John Gibson <johgibso@...> wrote: > Hi Neil, > > I don't think this works the way you hope it does. If you ask for tb(increment) where increment is, say .25, that gives you the start time of a 16th note at the very beginning of the tempo curve: it gives you the start time for the 2nd 16th in the first beat. That gives you an accurate duration for a 16th note anywhere in your sequence only if your tempo curve comprises one constant tempo. If your tempo curve has changing tempos, and you are playing a note in the middle of the sequence, this will not give you the right value. The beat values given to tb() are absolute, not relative. So a negative beat value doesn't make sense. > > J > > > > On Sep 12, 2011, at 3:15 PM, Neil Thornock <neilthornock@...> wrote: > >> Hi John, >> Yes, this makes sense. In my specific case, I'm using a starttime + >> tb(increment) approach with a long score-type file. Rather than go >> through the pain of figuring out the start time at that moment, I'd >> like to simply back up a few beats. I can work around it with >> conditionals but had hoped tb() could accept negative values. >> >> I see this in the source: >> >> 71 float >> 72 time_beat(float timein) >> 73 { >> 74 int m = 0; >> 75 float durp = 0; >> 76 >> 77 if (timein < 0.0) >> 78 timein = 0.0; >> >> Right there -- Is there any reason not to accept a negative timein >> other than that we don't want a negative start time? >> >> On Mon, Sep 12, 2011 at 1:07 PM, John Gibson <johgibso@...> wrote: >>> Hi Neil, >>> >>> Can you give us a simple score that illustrates this? >>> >>> If your current start time is 10 beats and you want to back up by 4 beats, you would just use tb(6), no? >>> >>> In other words, the tempo mechanism is not aware of where you are in the beat series, beyond what you feed tb(). >>> >>> J >>> >>> On Sep 12, 2011, at 2:48 PM, Neil Thornock <neilthornock@...> wrote: >>> >>>> Hi list, >>>> I'm using tb() to scale my durations. At one point, I'd like to back >>>> up from the current start time by a certain number of beats, but it >>>> appears tb() can't handle negative values. Is that correct? >>>> >>>> -- >>>> Neil Thornock, D.M. >>>> No Stopping, Standing, or Parking: >>>> http://neilthornock.net/mp3s/nostopping.mp3 >>>> Assistant Professor of Music >>>> Composition/Theory >>>> Brigham Young University >>>> _______________________________________________ >>>> RTcmix-discuss mailing list >>>> RTcmix-discuss@... >>>> http://music.columbia.edu/mailman/listinfo/rtcmix-discuss >>> _______________________________________________ >>> RTcmix-discuss mailing list >>> RTcmix-discuss@... >>> http://music.columbia.edu/mailman/listinfo/rtcmix-discuss >>> >> >> >> >> -- >> Neil Thornock, D.M. >> No Stopping, Standing, or Parking: >> http://neilthornock.net/mp3s/nostopping.mp3 >> Assistant Professor of Music >> Composition/Theory >> Brigham Young University >> _______________________________________________ >> RTcmix-discuss mailing list >> RTcmix-discuss@... >> http://music.columbia.edu/mailman/listinfo/rtcmix-discuss > _______________________________________________ > RTcmix-discuss mailing list > RTcmix-discuss@... > http://music.columbia.edu/mailman/listinfo/rtcmix-discuss > -- Neil Thornock, D.M. No Stopping, Standing, or Parking: http://neilthornock.net/mp3s/nostopping.mp3 Assistant Professor of Music Composition/Theory Brigham Young University _______________________________________________ RTcmix-discuss mailing list RTcmix-discuss@... http://music.columbia.edu/mailman/listinfo/rtcmix-discuss |
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