Try 'unbuffering' STDOUT by setting $| to a true value:

$| = 1;

print "hello\n";
sleep 2;
print "goodbye";
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jeffa

L-LL-L--L-LL-L--L-LL-L--
-R--R-RR-R--R-RR-R--R-RR
B--B--B--B--B--B--B--B--
H---H---H---H---H---H---
(the triplet paradiddle with high-hat)