Can you generate an audible sound to be amplified?

You can connect this to a power amplifier only if the output AC voltage matches the input sensitity of your amp. Most amplifiers these days have an input sensitivity of either 0.775 VAC or 1.4 VAC. The manufacturer does not include in their specifications what is the output voltage. Before connecting to an amplifier you will need to measure the output voltage to see if it's enough to feed your amp. If not you will end up frying your amplifier and will need to connect to a preamp before connecting to your power amp. I tried this with a signal generator and learned the hard way. Honestly you are better off purchasing a signal generator and preamp since a signal generator gives you a wide range of wave functions to work with.

Any ideas on how to hook it up to an amp with rca inputs?

If you are looking for a cable then https://www.amazon.com/CIMPLE-CO-Cable-Black-Professional/dp/B06XKLT756 if you already have RCA cable, then https://www.amazon.com/RuiLing-Female-Adapters-Coaxial-Connector/dp/B00VUG00FI

Can this generate low voltage square waves (20-40 mV peak to peak)?

one can always place a voltage divider on the output to get very low amplitudes

Can you set this to the Schumann frequency of 7.83 Hz? Can this generator pulse its output?

Mine can only be set in 1 hz increments

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Description

⚙️ Power your precision — signal generation redefined!

PLUG PLAY USB POWER - Forget batteries and adapters—power up instantly via USB for ultimate portability and convenience.
PRO GRADE TESTING TOOL - Perfect for debugging circuits, calibrating oscilloscopes, and analyzing audio amplifier responses.
INTEGRATED FILTER TOGGLE - Optimize your sine and pulse wave outputs with an easy on/off filter for crystal-clear signals.
PRECISION FREQUENCY CONTROL - Dial in frequencies from 1Hz up to 500kHz with pinpoint accuracy for flawless testing.
VERSATILE WAVEFORM GENERATION - Switch seamlessly between sine, square, triangle, and sawtooth waves to cover all your signal needs.

The 1HZ-500KHZ DDS Functional Signal Generator by Seesii is a compact, USB-powered device delivering ultra-wide frequency output from 1Hz to 500kHz. It supports multiple waveforms including sine, square, triangle, and sawtooth, with an integrated filter for enhanced signal clarity. Designed for professionals, it excels in circuit debugging, oscilloscope calibration, and audio testing, combining portability with advanced functionality.