Rubberband is pretty good, we are planning on using it in future versions of LMMS to support tempo/pitch independent changes to sample-tracks. Since we will be using it on sample-tracks, the processing can be precalculated and we can run the conversion with high quality settings.
1) Are you doing something wrong? Maybe. I'm confused why you are adjusting cents. Cents is a measure of pitch. The purpose of a tool like rubberband is to adjust duration and pitch independently. This is probably why you notice the pitch changing without a noticeable change in length. I would think you want to adjust something like "tempo", "duration", "stretch"... something along those lines. I never used Rubberband as an FX before, so I couldn't say for sure. 2) How many cents is 1 bpm? This depends on the actual tempo. 1 cent = 1/100th of a semitone or 1/1200 of an octave. To fit something recorded at 130bpm into 129bpm with a standard sampler (where lowering the pitch causes the length to increase) you would need: 130 to 129 bpm will require an increase in length of 1/129 (0.7752%) Therefore, the octave will need to drop by 1/129 of an octave (9.302 cents) This may or may not be right, it is 3:00AM and I am just doing this in my head. -Paul On Mon, Jan 25, 2010 at 11:09 PM, Louigi Verona <[email protected]> wrote: > Hey guys! > I am trying to stretch a loop to use in a song. I tried using various pitch > shifting ladspa plugins, like rubberband and AM pitchshifter, but no matter > how much or how so small I change the loop, it will not be flawless. The > original tempo of the loop is 130, the tempo of the song is 129. If I set > the tempo of the song to 130, the loop is perfect. > Using rubberband I tried adjusting cents, since a semitone is too much down, > but going even 0.5 cents down instantly produces very noticable artifacts > and there is always a noticable artifact in the end of the loop. I mean - I > hear the change in the pitch, but I do not hear the change in the length of > the loop. > > I tried doing auto stretching in QTractor, thinking I just cannot find the > correct value, but in QTractor the result is the same - there is a noticable > gap(artifact) in the end which makes the loop not perfect. > > Also, as soon as rubberband plugin is activated - the loop goes out of sync > with the rest of the song even if I make no changes - there appears a slight > pause before the loops starts to play. No such effect with AM pitchshifter. > > Eventually, what I did was change the pitch of the loop 15 cents down by > means of the Pitch knob in the lmms instrument window. It worked, although > did tune it down a bit, but hardly noticable. Of course, I would prefer to > stretch a sample without shifting its pitch. > > So I have two questions. > > 1. Am I doing something wrong with Rubberband or is it really not that top > notch? > 2. How much cents is 1 bpm? > > Louigi. > > ps: tried elastique stretching of the same sample in FL Studio. Although > nice result I did hear some slight artifacts. > > ------------------------------------------------------------------------------ > The Planet: dedicated and managed hosting, cloud storage, colocation > Stay online with enterprise data centers and the best network in the > business > Choose flexible plans and management services without long-term contracts > Personal 24x7 support from experience hosting pros just a phone call away. > http://p.sf.net/sfu/theplanet-com > _______________________________________________ > Lmms-users mailing list > [email protected] > https://lists.sourceforge.net/lists/listinfo/lmms-users > > ------------------------------------------------------------------------------ The Planet: dedicated and managed hosting, cloud storage, colocation Stay online with enterprise data centers and the best network in the business Choose flexible plans and management services without long-term contracts Personal 24x7 support from experience hosting pros just a phone call away. http://p.sf.net/sfu/theplanet-com _______________________________________________ Lmms-users mailing list [email protected] https://lists.sourceforge.net/lists/listinfo/lmms-users
