Convolute them, which is a multiplication in the frequency domain, and you will see the roll-off slope is twice as steep. Pink means the high frequencies roll off at a certain very natural rate. In audio, the piano has a ‘pink’ distribution of frequencies. It does become purple, but it also becomes rather dark. What happens when you use a piano chord as an IR and then sing through Altiverb, is much like what happens when, in lighting, you want to use a blue and a red translucent filter to create a purple one. You need to really boost high frequencies. Using audio like piano or voice normally results in material that sounds too dull. Whenever you like an impulse response do not forget to save it using the save to User IR folder button. Select this item, drop the audio and listen to the result. Special effects can be achieved by using audio such as piano chords, breaking glass, spoken word, or drum rhythms. Select this if the audio you are dropping is a finished impulse response (downloaded from somewhere, or obtained using a digital spike recording through effect gear), or if you want to experiment using other audio. When recording odd places like tunnels, shafts, pipes or other resonating places or huge stuctures (like stadiums) you might want to consider choose the next 30s sweep with 45s of silence after it, to capture a longer reverb. The 16 seconds is good maximum reverb time for normal rooms and halls. ![]() The 30 second sweep gives a (more then) great signal to noise ratio, bypassing any noise from the recorder, pre-amp and mics while 30 seconds is still short enough to hold your breath and ask people to stay quiet (very practicle!). This also is the one Audio Ease uses most of the times sampling rooms.
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