This paper analysis the same piece(s) of music performed with four different acoustic settings in Stavanger Concert House. All listeners and musicians were surprised by how big the changes in acoustics were. Even listeners who knew the concert hall from attending and playing the two halls many times were highly surprised over the demonstration. The changes between the different settings are surprisingly large also when listening to the live recordings. Analysing the recordings, however, we find that both the sound pressure levels and the overall frequency spectra are almost the same for all settings! In order to find the clearly perceived differences, we need to look closely into spectrograms, attack times etc., and inspect the lengths of the separate tones and how they are masked (if the reverberation is too long for the jazz/rock), or too short, (so that each note lacks build up to a "full tone" for the strings). Not only the decay time, but also the attack time is longer for the most reverberant settings. For fast piano-jazz trio, this prolonged decay due to long reverb "masks" the attack, and thus "smoothens" the timbre, and reduces the "brilliance". We need to discuss how early reflections influence (reduce) the attack time. A possible method for detecting the clearly perceived differences is to analyse Spectral Flux.
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