I made a new waveblaster board, PicoPango
available soon at https://serdashop.com/products/picopango
It features 2 synth engines (one more is under development, will come with software update) :

• GU-Wave wavetable sound voiced with the GU GS bank: 261 instruments, 13 drum kits, reverb and chorus
• FM-Classic: FM style general midi, 1990s style

• Switch easily between engines, using the Pangoset utility.
• 48-voice polyphony, all 16 MIDI channels
• USB-MIDI, class compliant: no drivers needed on Windows, macOS or Linux
• 3.5 mm stereo line out
• Compact PCB : 34mm x 34mm
• High quality Stereo DAC
• Powered from the sound card or from USB
• Easy firmware updates over USB: drag and drop a file (RP2350).