Create the following three short patches.  Refer to the attached "Sources" patch for the objects you will need.  You will not need any objects beyond what is shown there.  Words inside of brackets [  ] below are supposed to represent PD object names.

Patch #1:

Create two oscillators [osc~].  Wire them separately to [dac~] outputs 1 and 2 respectively.  Set their frequencies so that you hear a beating of 4 pulses per second.

For help see PD's "Help-->Browser" and in the folder "3.audio.examples" look for example "A08.beating.pd".

Patch #2:

As with patch #1, create two oscillators [osc~].   Using an audio multipler object [*~], multiply the two oscillators [osc~] and set their frequencies so that you hear a beating of 4 pulses per second.  You may need to recall the idea of "amplitude modulation" where one [osc~] is the "carrier" and the other is the "modulator". 
Connect the output of [*~] to [dac~] outputs 1 and 2.

Patch #3:

Build a patch that analyses the pitch of an incoming microphone signal [adc~] with [fiddle~].  Convert [fiddle~]'s MIDI pitch to frequency with [mtof] (MIDI to frequency) and use this number to set the fequency of an oscillator [osc~].  Connect the output of this oscillator to [dac~] outputs 1 and 2.

Hint: Use [fiddle~]'s first outlet, not the third!

REMINDERS:

1) When using PD, you must toggle between "Edit" mode where you can make new objects, move them around, wire them together, change their argumements/values and "Performance" mode where you can interact with the patch.

2) In order to hear sound through PD, you may have to check the box "Compute Audio" on PD's main window.  This check box stops and starts ALL audio processing in PD.

Attachment	Size
sources_patch.pd	1.53 KB