I'm fairly new to PD and am having trouble figuring out how to do something quite simple. I want to be able to get a bang whenever a certain sequence of two tones is heard by PD. I'm using fiddle~ to do the pitch detection and am able to detect single tones, but I want to be able to detect a sequence. For example, if I detect a pitch 61 followed by pitch 74, I want to output a bang. If I detect pitch 61 followed by any other value, I don't want any output.

In C, I would write something like:
if ((current_value == 74) && (last_value == 61)) do_something();

How do I do this in PD?

Hello Moose, welcome.

For detecting a fairly small sequence, say less than 16, you can cascade floats to keep a trail of integers. The example patch here follows 4 values. If they all (using [&&] to combine) match (using [==] to make the comparison) then you found an example of your target sequence. If you want to go bigger than 16 then you need something more extensible, which means defining datastructures or using lists ops.

regards,
Andy

http://www.pdpatchrepo.info/hurleur/900-sequence-detect1.pd

Wow, I wasn't expecting to get such a thorough response! That is exactly what I was looking for. Thanks obi!

Nice, I learned something as well