Up to five radios on the patch page, all running at once. Every Radio part opens its own device: choose the device and sample rate in the panel on the right, and type its frequency on the part. A device can only be on one Radio at a time; the list greys out a device another Radio already has, and says which.
Every speaker records unless you tell it otherwise. A Speaker part writes its sound to a WAV file by default, one file per speaker in your recordings folder and named after it, or to an MP3 file, the speakers, or any other sound output you pick. (MP3 uses Windows' own encoder; on Linux it writes WAV.)
The patch page borrows the receiver's radio. Opening the page hands it the radio the receiver was using, and the receiver switches to the signal generator. Closing the page stops every patch radio, finishes every file and gives the radio back.
Decoders that do not need sound do not offer it. A decoder that can work straight from the radio no longer also shows a second version that needs a demodulator in front of it.
SHA-256 of foxsdr-setup-0.99.17.exe:
a3232b89df0087d194610d559c20ae8730b758421aa7c13f3df68a33db2be6c7
SHA-256 of FoxSDR-0.99.17-x86_64.AppImage:
5bccfeddc9b090c67e313a3d3c38d9beeaa35ea56331cb6de98522693c23f2f0
SHA-256 of foxsdr-0.99.17-linux-x64.tar.gz:
e359798c1adbb4bb00841df3dcb349567b011505de42f17bf2900a32578bda12