The struggle is real, and the reward so sweet

[fredrik]

@dirty_g

One of the outputs is much louder than the other so I’ll check into that.

The different outputs on the 3340 have different voltage levels:

1222 Tuner VCO Module

Yeah, pulse is +Vcc minus voltage drop over the output transistor (which depends on current, but is nominally +Vcc−1.5V), while triangle output is fixed at +Vcc/3 (so 4 V with a 12 V supply) and any non-trivial load will affect the tuning (so you really want a buffer on that one). Ramp/sawtooth is +Vcc×2/3 (8 V), with more internal buffering. (there may be an argument for turning triangle or ramp into PWM outside the chip to make things more stable, cf the AS3340-HYB variant discussed here, but…

but different waveforms also have different RMS values (equivalent DC power), and as noted above different apparent loudness, due to different amounts of harmonics/overtones. Plus that your hearing isn’t exactly linear.