Questions about the Convolution node: predelay, hi-cut, and block size

[Yinxi]

Hi,

I'm experimenting with the Convolution node, and I have a few questions:

1- Predelay : When I set the predelay to 1000, I expected a delay of 1 second, but it doesn’t seem to match. Is it possible that the value 1000 equals 0.1 seconds ?

2 - Hi-cut : The hi-cut filter doesn’t seem to affect the signal. Am I missing something ?

3 - Block size : What would be a good block size to use for convolution reverb in terms of balancing CPU performance and audio quality? I was thinking of using a FixedBlockSize of 128, but I’m a bit concerned it might introduce too much latency.

Thanks in advance for any insight!