This is a description of the most common use cases.
It is assumed that you always have a PC or Mac, Atari computer, and a data recorder.

Record software on tape using an ordinary tape recorder connected directly to the PC

TURGEN was originally created for this use case.
Devices needed: Ordinary cassette recorder, connecting cable.

Create a project and populate it with project items
Connect the input of the tape recorder to the output of the sound card using a cable
Select project items
Insert a blank tape in the tape recorder, position the tape
On the tape recorder, start recording
Generate and send signal to the sound card
When the signal generator has finished, stop the recording

Record software on tape using Tape Self-Extractors (TSFX) and a data recorder

If you don't have an ordinary cassette recorder (these are hard to obtain), you can still record on tape using your data recorder.
Devices needed: Powerful universal cartridge, or a disk drive emulator that can be connected to the Atari computer simultaneously with a data recorder.

Create a project and populate it with project items
Select project items
Create TSFXes from the project items
Copy the TSFXes to an SD card
Place the SD card in a powerful universal cartridge or a disk drive emulator.
Insert the cartridge in the cartridge slot of the Atari computer or connect the disk drive emulator
Insert a blank tape in the data recorder.
Launch the TSFX from the universal cartridge or disk drive emulator
Press PLAY+RECORD on the data recorder
Press START to record the software on tape

Transfer software to the Atari computer using a cassette adapter and a data recorder

Devices needed: Cassette adapter

Create a project and populate it with project items
Connect the input of the cassette adapter to the output of the sound card of the PC
Insert the cassette adapter in the data recorder
Select project items
Instruct the Atari computer to read data from the data recorder
Press PLAY on the data recorder
Generate a signal and send it to the sound card.

Create WAVE files that hold signal representing the software

Create a project and populate it with project items
Select project items
Generate and store signal to WAVE files

Create WAVE or CAS files from multiple project items (tape sides)

Create a project and populate it with project items
Select project items
Select the Create Tape Sides tool
Setup parameters (duration of the tape side, gaps between files, output format, etc.)
Create the tape sides