This two weeks were mostly spent having discussions on the equipment to buy, we took time to decide on the final components to use. We decided ultimately to go for the raspberry pi 5 in order to be safe in terms of processing power. We opted to buy a powerful DAC/ADC to provide proper resolution and sampling rates required for live audio.
I personally spent time setting up the DAC/ADC to work with the guitar. I had to figure out a way of getting the sound out of the DAC/ADC and getting the native sound of the guitar to it. For my initial testing I opened a 1/4 line cable and connected ground and line to both left and right channels of the analog input of the ADC. I was able to pick up a signal and using a software called Audacity I was able to record some audio signals for testing and feel the response in signal. Next time I'm at the open lab I will be taking measurements of the guitars latency just passing through the ADC so that we have a benchmark of what we might expect going forward.
As far as the VST effects I have taken some time aside to learn more about DSP techniques that might proof useful to clean up and improve the sound quality of the guitar effects. I spent some time looking into window functions and FFT. My end goal with this research is also find a fast way to get frequency measurements of the audio signal in order to create frequency specific effects. For example, it would be desirable to find a way to increase/decrease the distortion of the signal in some frequencies as it makes the sound feel more like a real distortion effect. From performing some frequency analysis on the current iteration of the distortion effect I find the low frequencies much more affected by distortion than the higher frequencies. As seen in the picture below, you can see that the response is not at all flat even when I'm playing an open chord.
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