As the game is set in the Georgian Period it made sense to me to use instrumentation that would have existed around that time. One of the key instruments of that period was the Harpsichord. Looking back at reference words and music though, the Harpsichord by itself didn't quite fit the bill sonically. This is where production techniques were utilised to help transform the Harpsichord into an instrument that sonically would work better.
Below you can hear an unprocessed, very basic chord progression played on the Harpsichord. As you can hear the instrument is quite brash and in your face. As this game requires some more atmospheric, darker tones some production has to be be done to get a tone that suits.
Below you can hear processed versions of the chord progression and also a note that has been time stretched and reversed. As I'm sure you will agree these are far from the original sound of the Harpsichord.
The screen shot below shows what processing was involved on the chord progression. The equaliser eliminated a lot of the high end of the instrument, pushing it further back into the stereo field by taking away the higher frequencies. The clip distortion then added some grit to the sound. This is then followed by chorus, flange and delay.
Such production techniques are useful as you can still use an instrument that is say relevant time period wise but doesn't quite suit the mood of the game. So by steering away from using standard sounds or presets, you can increase your sound palette by manipulating the audio.