[Windows Mobile Apps and Games] quicksite:
yes, I bought PocketPlayer last year, and at time it was best thing around, except: (1) it wasn't finger friendly nav, and (2) processor intensive or memory hog. I even made a video comparing it to Nitrogen:

http://www.youtube.com/watch?v=7GSKCnWUoic

Sounds great, scalable...

That's fricken awesome. Right now that kind of functionality is parsed out into apps on iphone and Android phone. Meaning, there are very good dedicated voice recorder/ playback apps with great bulletproof clear UIs, and for podcasts, and for audio books. There's a push-pull going on with this whole "apps" thing. It's clear to me that one of the incentives that spurred Apple into the direction of app store was its lack of multi-tasking... thus, by opening small dedicated apps, then closing and opening another dedicated app, they give the illusion of multi-tasking.

But on Android there is true multi-tasking, as has been with WM all along. So it's worth noting that I think part of the market forces driving app stores is "follow the leader" because customer has been conditioned for them, and partially because the dedicated widget concept is really gaining favor with the newer interfaces (such as Android, and especially the HTC hero, with 7 home screens that effortlessly glide together)... because you can group related widgets onto a page for music apps.

For example, I have such a page with a mini music player, that clicks and expands fullscreen and full features. Plus I have Pandora widget. Plus Grooveshark.

So, I am just saying that it's worth it to consider this new behavior pattern of clustered applets -- competing against the robust full featured, multi-interfaced app as you describe. I have to say that from today's marketing perspective, you might want to envision your product like the 4-piece jigsaw-puzzle logo for Microsoft Office, as one thing -- full featured, yet also componentized, so that you could entice new users with what they would think of as a dedicated app or widget, and the selling point is 4 integrated widgets... Part of what I am saying are real factors, and some of them are market forces that have conditioned people's thinking and behavior.

Nothing better than when one has a great end goal and loves working on the entire process of bringing it together.

One thing I would add which you didn't mention -- and I have still not seen anywhere, glaringly not even in Papa iTunes for Macs and PCs -- and that's a stereo balance control. Seems like such a simple thing yet it doesn't exist.

The arguments are: "the music is perfectly balanced, and with headsets there is no need"... but that is totally ridiculous. (a) Many people still like rare live recordings of musical acts, and old jazz great performances where the mixes are NOT perfect.. and just a slight shift in balance makes a crappy listening experience suddenly great again. (b) when reality strikes and one of your earbuds or speakers go bad and now you have music in one ear and ugly distortion in the other ear... balance would smooth that out a bit. (c) or you're watching a youtube music video that hasn't been optimally recorded, or gets screwed up by codec or in uploading.

And then of course the other missing old-school staple: switch to mono in both ears... for when you're listening to dictation, or voicemails, and they often play better in the head spatially when that once channel recording can get duplicated to the other channel.

and now i shall shut up.

Please plan to release a version of your app to Android! hasta la vista