I know what you are saying about the calls...but, the best description I ever heard describing the call of the bri-bri, is that they sound like a rain-bird sprinker... ch-ch-ch-ch..... as it goes back and forth. While the sound of the luec is more like a song bird. Same goes for the Philobates.
Do you have an *.mp3/wav/wma/etc. of this 'chirping' call? I've never heard it...at least I don't think I have...Also, it seems auratus have 2 kinds of calls...an odd buzzing sound and a cricketlike chirping which is pretty neat also. Are these 2 different calls from one frog or does it depend perhaps on population?