“Additionally Yours”
https://soundcloud.com/neurogami/additionally-yours-disquiet0246
Thinking about how to approach the time-shift, I decided to mix two techniques. One, the tempo changes, and with it the speed of the notes played. The other idea was to use a fixed sample; its speed would not change, but as the tempo changed the allotted time in each “pattern” would change as well. The sample would get truncated and loop at different points depending on the BPM.
The track was made using Renoise, which allows you to automate the song BPM. Turns out that 32 BPM is the slowest allowed in Renoise; that’s were things start. The base BPM then gets doubled, then quadrupled, then sextupled.
I first recorded a bass line sample to fit the 32 BPM setting. Renoise uses “patterns” in tracks to organize songs. The bass sample starts at the beginning of each pattern. The number of lines (lines-per-beat) in each pattern stayed fixed at 16.
At 32 BPM the entire bass sample plays. At 64 BPM you hear (naturally) only the first half before the next pattern comes up and the sample starts again. And so on. By the time we reach 192 BPM you hear just the first two notes of the sample.
Over this bass I added some piano and percussion, using some delay, ring modulation, and comb filtering to vary the sound.
Some observations: When the BPM first doubles it is hard to detect, owing, I think, to the nature of the percussion. The project guidelines reminded me of a previous Junto where I ended up using Risset tempo changes (http://neurogami.com/blog/neurogami-risset-s-walk.html).
Renoise allows you to set the lines-per-beat for a song. I typically work at a higher BPM; 16 lines for a pattern does not allow for much granularity. It’s not a big deal at 32BPM, but at 192 BPM it gets hard to make subtle adjustments. Note-place and occurrence in Renoise is controlled by line number plus any option delay effects. This is one of those “don’t realize it until it happens” things that influenced the direction of the melody at the higher tempo.
The tempo changes are mixed over the course of the track. 1,2,4,6,1,2,4,1,2