I know the gba and nds fire emblem games all have unlockable sound tests:
Fire Emblem
Fire Emblem: Fuuin no Tsurugi
Fire Emblem: The Sacred Stones
Fire Emblem: Shadow Dragon
Fire Emblem: Shin Monshou no Nazo ~Hikari to Kage no Eiyuu~
As for partners in time, I'm pretty sure it doesn't have one. I've beaten the game and didn't unlock one at least.
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