He also goes on to discuss architecture, acoustics & ambience and in the process comes out with the ultimate film makers decision making motivation: ‘It all depends on the dramatic intent of the moment.’
Murch: “On every film I try to think as deeply as I can about the implied acoustic space of each scene; I then try to tailor the reverberant quality of the sound, and the tonality, to the spaces that we’re looking at. It’s endlessly fascinating, particularly because this technique flies “below the radar” of the audience. The filmmaker can have an effect on the audience without the audience knowing where that effect is coming from. Which I would guess is something that architects enjoy playing with, too.”
BLDGBLOG: “As far as an acoustically rich space goes, is there a specific place – or a building or a landscape – where you like to record sounds for use in a film? How does the actual space affect the sounds you can record in it? ”
Murch: “Well, first of all, I record a sound without any atmospheric envelope around it. I then take that recorded sound and find an acoustic space that is as close as possible to the acoustical space in the film; I play the sound in that space; and I record the resulting reverberation on another device, placed to extract the maximum reverberation. Then, in the final mix, I have the ability to blend those two sounds: the “dry” sound itself, alongside a sound which is almost all reverberation.
In musical terms, you could say it’s like the relationship between the string of the violin and the reverberation and amplification added by the body of the violin itself.
By first separating and then balancing those two elements together, I can custom-fit what seems to be the right dimension of sound implied by the space on screen. If you have too much reverb, and you don’t hear enough of the original sound itself, the result is too diffuse and ethereal to be realistic – but sometimes that lack of realism is exactly what you want. On the other hand, if you play proportionately too much of the dry sound, it doesn’t seem to connect to the space you’re looking at. But maybe that’s exactly what you want – that kind of dislocation It all depends on the dramatic intent of the moment. But these two elements give you the handles to control the final result.”