Can startup.scd execute synths?

1

Long time ago, several SC versions ago, i used to put synth code in the startup file so that it would run on a monitor-less computer, just starting the machine.
i just tried on 3.11.1 and only booting the server seemed to work.
all i have for now is a simple {SinOsc.ar(333)}.play; just to test that it works
what am i doing wrong?

2 
s.waitForBoot {
    ... play stuff...
};

hjh

3

DOH! thanks!!! amazing!