This has a lot to do with why they've been eating Roland's lunch for the last several years, while that latter company keeps trying to convince buyers that completely locked down circuit simulation of classic devices at fancy prices is what the people want.
At the cheaper end of the scale, companies like Sonicware are exploiting commodity-priced microcontrollers for their 12-bit synthesis and processing capabilities. While their own offerings are not open-source, abundant resources exist for anyone interested in processing audio on crunchy chips and you can get into it for about $20 in hardware costs (years of your life not refundable; synthesizers are nerd crack).