i-Sound has three built-in filters: high-pass filter, low-pass filter and notch filter.
- Low-Pass Filter - cuts Frequencies from 0 to a specified Frequency.
For example you can reduce tape hiss by activating this filter at 14-18KHz
- High-Pass Filter - cuts Frequencys from a specified Frequency to half of the Sampling Rate.
This can help you reduce hum from power the line at 50/60Hz
- Notch Filter - to amplify a certain Frequency Range.
This can improve voice recording if you activate the Notch Filer for 1-3 KHz.