>> Biamp Tesira FIR Block doesn’t allow values +/- 1,
>> Is there a way to remove them during export?
On the FIR Designer export tab, there’s an “Output Gain (dB)” parameter. Use this to reduce the bulk level of the FIR filter by entering a negative dB value until the +/-1 warning goes away, then export.
Then elsewhere in the Biamp Tesira system, add a gain block to boost to recover the lost level (if you need to).