Makoto Oshiro is a Japanese sound artist based in Berlin, who specialises in creating unique instruments based off of electronic signals, whilst also incorporating movement and light into the designs. He has carried out multiple installations and performances using these instruments, and in his lecture showed us how he made his most well-known instrument, the Kachi Kachi.
He started the lecture by playing us an excerpt of a piece he had made with the Kachi Kachi, which although interesting at first, I honestly found a little repetitive after a while. The Kachi Kachi uses an electromagnetic relay (the same device that makes the sound for car indicators) as its means of producing sound – this makes it a very percussive, rhythmic instrument which is capable of producing only one noise. The intervals between each ‘click’, as it were, are controlled by a timer circuit which turns the electromagnetic relay on and off using a square wave the trigger the response needed to produce the sound – the timer is manipulated by a knob on the Kachi Kachi that can be turned to either speed up or slow done the frequency of the clicking sounds. Oshiro describes this process as a form of “acoustic oscillation”. He then layers multiple of these instruments together to create pieces.

Although I didn’t find the piece that Oshiro had made with the Kachi Kachi particularly engaging, I was very interested by his process of making the instrument. Building an instrument has always seemed very daunting to me, and I have shied away from it in the past, however the Kachi Kachi seems like a very simple instrument to make and the talk did demystify the process for me a little bit. If I were to use the Kachi Kachi, I would only want to use it as an element of a piece rather than making it the main feature, however I appreciate that Oshiro was probably attempting to demonstrate the instrument he had made, rather than make it part of a wider piece with other elements.
Overall I found this to be an interesting concept, and I am hoping that we get to study a unit in second year on building instruments as I would like to start making my own unique sounds that I can incorporate into my pieces. Seeing that an instrument doesn’t have to be complicated and that it can be just as simple as hooking a couple of pieces of electronics together has made me feel as though there is an easier point to start from than what I previously thought.