Static Wiener Filter FF
This was done for LLO during S6. (cf. "Global ..." by Ryan, Jenne, etc.)
Adaptive LMS based FF
Seismometers and Accelerometers at the 40m used to reduce noise in the 40m IMC. (cf. "Adaptive..." paper in RSI by Jenne, et al.)
Mic based Acoustic Noise Cancellation
SURF by Clara, few months project by Ayaka Shoda (from U. Tokyo)
Magnetometer / 60 Hz subtraction
Some done by Nic and Anamaria for S6 at LLO