[PD] is /etc/rc.local the script that runs on boot?

[Alexandros Drymonitis]

I want to launch Pd when my raspberry pi boots, so in /etc/rc.local I wrote
the following, just before 'exit 0'

usr/local/bin/pd -nogui -open ~/pd_patches/load_test.pd

The patch that's supposed to open turns the DSP on on load and outputs a
sine tone at 440 Hz. But when I power up the pi, I hear nothing out of the
headphones (I tested the patch and it works if I launch Pd from the
terminal).

If I type 'top' in the terminal, I see that there's pd taking some small
CPU, but after I exit top, if I type 'killall pd', I get this:
pd(2097): Operation not permitted
pd: no process found

Is this 2097 Pd's pid?

What am I doing wrong?
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