My transcription for organ of the first aria from Cantate BWV 4 "Christ lag in Todes Banden" and the final choral.
Krzeszow organ has no tremulants. However, recently V4.0.0 Extension was released (hauptwerk-organ.com) which has artificial tremulants implemented for Positive and Oberwerk. I like the way how the tremulants are voiced; I used them here in combination with the Hautbois c.f.
If you own 'Krzeszow' I would recommend to download this extension!