Really? Can you match ST to Orban and make zilion people happy.. and we can finish that story?
Haha. Matching only a few parameters can take from several minutes to several days. Matching ST and Orban would probably take decades or centuries but it should give the closest match eventually.
Ok, I found what's causing it - it's the bug fix to avoid overreacting to certain tones in RMS mode. Now, if you hear clicks, those clicks must have been present in the old version, not the new one. So unless this change is actually causing issues (and I don't think it is - with slower (more realistic) attack/release the difference is also much smaller), the new version should actually be better.
The clicks aren't in ST. You asked me to process the same test signal with the same preset in 9.23 and 9.30 and listen to the difference. The difference signal is not
silent. Because it's short I loop it. That makes it sound like clicks but I guess if I use a long test signal instead it would give an ongoing tone.
Besides that I don't get why the peak compressor needs or is affected by a RMS mode fix, the problem seems to be you consider it a minor change because you didn't meant to introduce a new type of compressor. However the difference between 2. and 3. in my above post is 40 dB
. If that doesn't qualify as a new type then I really don't get it.
Anyhow if you like the new peak mode better you unintentionally introduced fine. But we need a legacy mode with the old attack curve behaviour or we're stuck at 9.23 (which might not be the end of the world).