Improving the sound

Can I remove echo or room reverb from a recording?

Not as a dedicated control — Cast has no de-reverb. Noise removal targets steady noise (hiss, hum, room tone), and it will not pull the echo out of a recording made in a bare, reflective room.

Where: n/a.

Steady noise is a separate thing sitting alongside the voice, so it can be told apart and subtracted. An echo is a copy of the voice itself arriving milliseconds later in the same waveform — subtract it and the voice goes too. — Why the honest answer is no: an echo is your voice, not something next to it.

This is worth being straight about, because the whole category is vague on it. Echo is your voice arriving twice, so removing it means separating a sound from a copy of itself — that is a much harder problem than removing a steady hiss, and no editor solves it cleanly on an already-recorded file.

What genuinely helps is recording into something soft: a room with a rug, curtains and furniture, a mic closer to your mouth, and a body between the mic and the nearest bare wall. Fixing the room beats fixing the file.