Well, try to understand my explanation.
When it was my Azden mixer fmx32 knew I had my hands on a sound budget and with little presence in the market, no evidence of sound available and some opinions describing him as poor sound and obviously not at the level of shure, sound device, Wendt, PSC, Fostex, etc ....
However, the first impression is that you know how to configure the connections and know its usefulness and limitations. For example, this mixer does not raise much Azden microphone gain, but the price is a decent fighter. When you have a Sony PCM M10 and want to use microphones that require phantom power, it is recommended that sensitive microphones and excite with not much power, hence the mixer does a good job and noise levels are acceptable and easy to cancel or decrease in post-production. Is a versatile and economic alternative considering the battery life, since the Azden FMX32 can work well with 6 cells (six battery), more or less from 9 to 12 hours, depending on conditions of use. Each channel (3) has its own phantom switch. The LED meter is something discrete levels, but practicing is called the way they operate. Another important thing is to set the input levels on the recorder to use the mixer with ease, ie ensure the maximum level of entry into the recorder with the maximum output of the mixer, monitored from the recorder and from the mixer and will have an acceptable level to equalize and standardize post-production.
With respect to use with the Marantz PMD 661, say that you have to play with the configuration of PMD to find the point of balance. Remember to connect the PMD must be with the switch to "LINE" otherwise find extreme saturation, distortion rare, or loud and annoying levels. As with any writer, the Azden given a moderate and dry signal. The advantage is that the PMD save battery by not having to use the phantom power source and you can play with an extra inning.
Regarding the question to record music or bands with the Azden, I would say it depends on the microphones are used, plus the delivery FMX32 a signal, I would describe as a dry, flat and without much "flavor", but this also depends on microphones and further work in treatment track. In short, a good field mixer, low price, limited the power of the profits to the microphones, but versatile, robust, performs with pride in the rate of battery consumption, and is a good team to enter the world of the mixture of field sources ...
I hope you understand my English robot to Tarzan
A hug from Chile