Tom Service investigates the rise of the synthesizer. How did this initially crude assemblage of electrical components develop in a few decades to become one of the most ubiquitous and flexible of musical instruments? He consults Peter Zinovieff, inventor of the first British commercially available synthesizer (the VCS3, made in his garden shed in Putney); and also young composer/performer Hannah Peel, who likes to work with the sound of vintage analogue synths.