Actus Tragicus, BWV 106

I thought this a nice piece to show of the Holpijp of both the Manuaal and the Rugwerk.
It's a transcription by Alexandre Guilmant (available on imslp) that has tha advantage (in my opinion) that only the bass notes are repeated. Other transcriptions have also repeated chords in the left hand, wich creates more restlessness that fits this piece.