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I can see another use for these as well: tuning while live. If they self-amplify, you should be able to use an attenuator cord to hook it directly to a VCO output, then when you suspect tuning issues, just plug it into a different waveform and hold the speaker up to your ear for adjustments. Given that you've got some volume with these (apparently), this should be sufficient to let you hear the VCO against the PA so that you can correct things. This would be very useful for synthesists who don't have mixers with a CUE function.