This was because, by then, his second venture Neural DSP was already making headlines, with Castro being named Finland’s EY Entrepreneur of the Year that year. Castro founded Neural DSP (short for digital signal processing) in 2017 alongside his friend and fellow musician Francisco Cresp. The company represented a “very natural transition from Darkglass”, Castro tells me, this time targeting a much bigger market, encompassing both guitar and bass players. A business for and by creativesSimilar to Darkglass, Neural DSP collaborates with artists and groups, including Tim Henson, Petrucci and Plini. That would not work for Neural, which is attempting to create dozens more tools in a shorter period of time.