Alan Ratcliffe wrote
I'm not sure why you wouldn't just use the convolution reverb on an aux buss (or even on your drum buss)? An aux buss 'verb lets you control how much ambience each drum track gets and if you change the mix of the drums at any point, the change is also reflected in the ambience.
A fair comment. However, this trick is not just to add reverb. There are a few reasons and I'll be happy to list them:
1. Not everyone has a multi-core machine with huge amounts of processing power so this trick will inevitably enable you to save your CPU for other, more important duties and enable you to use more CPU hungry plugins.
2. It will save you the time of having to send multiple tracks to one aux track, which also eats up processing power.
3. The purpose of the trick is to simulate room microphones and not merely to add reverb. That is why I recommend impulses as they are more realistic than algorithmic varieties (although they also have their place, for sure). I added in my post to make sure you have a near-finished balance of the drums before you proceed so that you can maintain a natural approach. I also recommended splitting the resultant stereo file for this purpose. Once you have recorded a room sound with a stereo pair of mics there is no going back anyway, wouldn't you agree?
4. Adding a reverb plugin to a drum bus will cause the kick drum to flutter within the reverb because it will most likely be emphasized if you are mixing pop/rock and will be distracting to the listener (unless it is a deliberate effect). If you listen to a natural room recording of a drum set, the kick drum is usually not as loud as, say, the snare drum, which will be the most prominent component because it has the broadest bandwidth of any of the other drums and the widest dynamic range.
5. Visualization when you mix is everything. So is committing to a sound. You can tweak as much as you want, but there is something to be said about a printed track that you have committed to. It is more tangible. Using GOOD sounding impulses is also key. That is why I recommended the Bricasti impulses. You have to do very little to them to make them sound great and that is also key. The better the impulse, the less you have to labour. Not all reverbs are created equal.
6. In this case, auditioning the sound 100% wet is key because you're attempting to simulate what that drum set you just recorded (or programmed) sounds like in an
actual room. This, IMO, is CRUTIAL to a realistic drum sound. Furthermore, because the reverb is now an audio file, whatever processing you apply will be less intensive than on an FX or aux track because the resulting audio (pre-processing) has already been rendered.
In closing, I just want to say that I think one of the worst things to happen to audio in the last 20 years is the fact that we have too many options as a result of the open-ended nature of DAW recording. Committing to how a track sounds as soon as your opinion forms is the best time to move on because, as Occam's Razor states:
The simplest answer is most likely the correct one.
Cheers ?