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In this example, you can play notes by pressing the mouse on the kslider object, and when you release the mouse, the notes will be turned off. When the mouse button is released, that fact is reported by a 0 from the left outlet of the mousestate object.

This example shows how to control glissando using MIDI. A little bit of revision: MIDI notes can only be played with whole numbers 0-127. Some synths allow you to specify an alternate tuning other than 12-tone equal temperament, but that’s not what we’re after in this case. So, let’s say, if you’re converting frequency to midi note values you will need to calculate the desired pitchbend from the fractional part of the value you obtain from ftom.

This patch provides an example of simple interactive improvising program that plays a melody influenced by the notes played by a live performer. Based on the most recently received MIDI note, the program chooses a scale to use for its melody, and moves melodically in a straight line toward the pitch and velocity most recently received. The program has only one use of randomness, to make a probabilistic decision. It has a small musical knowledgebase of three scales, and a set of probabilities determining which scale is more appropriate for use at any time.

You can assign input data to have a different function at different times, simply by sending it to different parts of your program. For example, if you have a control device such as a MIDI keyboard or other MIDI controller with a limited number of keys, buttons, knobs, or faders, you can assign one control element to be the mode selector that changes the functionality of all the other elements.