X-Git-Url: http://shamusworld.gotdns.org/cgi-bin/gitweb.cgi?a=blobdiff_plain;ds=sidebyside;f=include%2Fstretching-regions.html;fp=include%2Fstretching-regions.html;h=f6a88a87280ac3e73fc89c22bf4656fb761b0e31;hb=7717f195fe7bb1ba864bf4d9f552c15cccac7bc1;hp=0000000000000000000000000000000000000000;hpb=14f05f96ea7bd6d602c103c4a4de8042cbfe0949;p=ardour-manual diff --git a/include/stretching-regions.html b/include/stretching-regions.html new file mode 100644 index 0000000..f6a88a8 --- /dev/null +++ b/include/stretching-regions.html @@ -0,0 +1,107 @@ + +
+ The Stretch Mode tool can be switched to by selecting it in the + Toolbox, or simply by hitting the T + key. +
++ It allows to extend or reduce the duration of a region, optionnaly maintaining + its pitch. This is one of the few operations in Ardour that affect the underlying + audio data from a region, even if the original audio is kept safely—no data + is lost in the process. +
++ This operation is usually used to fit an audio sequence with a different rhythm + into a session, but can be used in a wide area of cases, due to its ability to + maitain or alter the pitch. +
+ + + ++ The Stretch Mode tool is very similar in use to doing a trim in grab mode: the + boundary (start or end) is left-clicked and dragged to + its wanted position. Notice a timer appearing, showing the new duration of the + region using the same clock mode as in the + primary transport clock. +
++ Stretching is a complex operation (phase vocoding), involving resampling, + frequency analysis and synthesis. The parameters used to transform the audio + data are user tweakable, and exposed to the user as the + left mouse button is released: +
+ + + ++ The Time Stretch Audio window is made of: +
+ ++ The Contents should be selected to best fit the actual content of the region, amongst: +
+ +Content | +Disable phase resynchronisation at transients | +Band-limit phase resync to extreme frequencies | +Disable phase locking to peak frequencies | +Use longer processing window (actual size may vary) | +Use shorter processing window |
Mushy | X | X | X | ||
Smooth | X | X | |||
Balanced multitimbral mixture | X | ||||
Unpitched percussion with stable notes | X | ||||
Crisp monophonic instrumental (default) | |||||
Unpitched solo percussion | X | X | |||
Resample without preserving pitch | see below |
+ While the table above details how the different kinds of audio material + alter the fine-tuning of the DSP, from an user point of view, the operation often + consists in trying different settings and listening to the result. +
+ ++ The best way to start experimenting is to consider the material itself: +
+ +