Tutorials and Topics - Peabody Computer Music

Tutorial 13Sampling:Recording and playbackThe most obvious way to use the play~ object is to send it a linearly increasing (ordecreasing) signal from a line~ object, as shown in the tutorial patch.Read through a buffer~, from one position to another, in a given amount of timeReading from 0 to 2000 (millisecond position in the buffer~) in a time of 2000 msproduces normal playback. Reading from 0 to 2000 in 4000 ms produces half-speedplayback, and so on.• Click on the different message box objects to hear the sound played in variousspeed/direction combinations. Turn audio off when you have finished.Although not demonstrated in this tutorial patch, it’s worth noting that you could useother signals as input to play~ in order to achieve accelerations and decelerations, such asan exponential curve from a curve~ object or even an appropriately scaled sinusoid from acycle~ object.SummarySound coming into the computer enters MSP via the adc~ object. The record~ objectstores the incoming sound—or any other signal—in a buffer~. You can record into theentire buffer~, or you can record into any portion of it by specifying start and end bufferpositions in the two rightmost inlets of record~. For simple normal-speed playback of thesound in a buffer~, you can use the count~ and index~ objects to read through it at thecurrent sampling rate. Use the line~ and play~ objects for variable-speed playback and/orfor reading through the buffer~ in both directions.128