apf.audio is a one-man show run by Seb Holzapfel based out of Heidelberg, Germany. We build open-hardware, open-source musical instruments. Our niche is FPGA-based audio and video synthesis, a technology historically persued only by the largest manufacturers due to immense R&D costs. The recent advent of open-source FPGA tooling and innovative hardware description languages means this can change.

At apf.audio, our aim is to enable everyone to build truly reconfigurable, powerful audio and video hardware. To this end, we are very interested in educational use and enabling new kinds of audiovisual experiences with our products. If this speaks to you, feel free to get in touch.

funding

Our long-term goal is to be fully supported by product sales. As most apf.audio products are open-hardware, and all R&D self-funded, this is not easy.

We would like to acknowledge partial funding of the Tiliqua project from the NGI Commons Fund, a fund established by NLnet with financial support from the European Commission’s Next Generation Internet program.

creative space

We like to acknowledge support from the City of Heidelberg, who are providing us with subsidized workshop space for the apf.audio labs inside the DEZERNAT#16 creative space. If you are in or around Heidelberg, hit us up!

acknowledgements

Our projects would not exist without the hard work of many (awesome) open-source projects. An exhaustive list would take pages, here I mention only a crucial subset:

• Python-based HDL and SoC framework: The Amaranth HDL and Amaranth SoC projects.
• USB and SoC gateware: The LUNA and Cynthion projects.
• Miscellaneous gateware: the Glasgow project.
• RISCV softcore: The VexRiscv and SpinalHDL projects
• USB audio gateware and descriptors: The adat-usb2-audio-interface project.
• Audio interface and gateware: my existing eurorack-pmod project.
• SID emulation gateware: reDIP-SID
• The "mi-plaits-dsp-rs" project: mi-plaits-dsp
• The "pico-dirtyJtag" project pico-dirtyJtag