How to control volume for DAC with no volume control

Just wondering how people control volume when using a DAC with no volume control?

Don't want a pre-amp if I don't need it.

you can connect the dac to a passive preamp, which is just a volume control - schitt makes a very reasonably priced one

The only way would be to use the volume on the software.  My amp has a volume attenuator so I can run it bypassed but not always.

Using digital volume attenuation is very lossy: you are much better off using a passive preamp.