Per Wiki there's 5 phrases that can be said:
"Blast off!" (start of a round)
"Alert! Alert!" (enemies approaching)
"Battle stations!" (formation attack)
"Spy ship sighted!" (Spy ship advancing)
"Condition red!" (enemy attacks become more aggressive; occurs when the player takes too long to clear a round, or misses the spy ship)
Preliminary samples are in place, and currently take up 7107 bytes of ROM. Ironically "Alert! Alert!" takes up the most space:
1979 alertalert.pds1335 battlestations.pds1070 blastoff.pds1240 conditionred.pds1383 spyship.pds
So I should be able to save quite a bit of space by adding logic to say "Alert!" twice Menu - Left Difficulty controls display of (A) diagnostic values of SYSTEM and TIMER, or (B) START A random sample will be played on the game screen (still showing a rainbow) For Harmony on a 2600 or Stella-5.0.0-pre7 or newer. draconian_20170504.bin
Test builds for 7800: drac_7800test5.bin drac_7800test6.bin