This release does not have a Play Store Description, so we grabbed one from version v3-build-820-play:

Poweramp is a powerful music player for Android.

Poweramp v3 is a major update focused on the new Audio engine, UI, and navigation.

• new Audio engine:
• support for hi-res output (where supported by the device)
• new DSP, including updated Equalizer/Tone/Stereo expand, and the new Reverb/Tempo effects
• internal 64bit processing
• new configurable per-output Options
• new configurable Resampler, Dither options
• opus, tak, mka, dsd dsf/dff formats support
• gapless smoothing
• 30/50/100 volume levels (Settings/Audio/Advanced Tweaks)

• new UI:
• visualizations (supporting .milk presets and spectrum)
• new "wave" seekbar, can be also static via Skin options
• Light and Dark skins included, both with Pro Buttons and Static Seekbar options
• new notifications
• new menus, panels, popups, dialogs, etc.
• as previously, 3rd party skins are available (v2 skins are not compatible)

• new navigation:
• pull down or click album art to go to the current playing list
• as previously, swipe album art for the next/previous track, drag more for category
change (applies also to the bottom miniplayer)
• use bottom miniplayer to return to the main ui or to change tracks
• swipe left/right from lists for fast return
• pinch-zoom in lists
• long press on item for the selection menu

Key Features:
- plays mp3, mp4/m4a (incl. alac), ogg, wma, flac, wav, ape, wv, tta, mpc, aiff; V3 also plays opus, dsd (dff/dsf), mka, tak, flv (audio)
- 10 band optimized graphical equalizer for all supported formats, presets, custom presets
- separate powerful Bass and Treble adjustment
- stereo eXpansion, mono mixing, balance
- V3 has the new Audio Engine with Float32 internal sample format, Float64 DSP processing, up to 384khz sampling rates, selectable swr/sox resampler, multiple dither options, various per-output settings, and much more
- V3 adds tempo controls, reverb effect
- V3 supports Hi-Res Output (where supported by the device)
- unique Direct Volume Control (DVC) for extended dynamic range and really deep bass
- crossfade
- gapless
- replay gain
- plays songs from folders and from own library
- dynamic queue
- lyrics support, including lyrics search via plugin
- embed and standalone .cue files support
- support for m3u, m3u8, pls, wpl playlists, playlist importing and exporting
- downloads missing album art
- V3 supports artist images downloading
- custom visual themes, lot of skins available on Play
- widgets with many selectable styles, advanced customizations
- lock screen options
- V3 adds Milkdrop compatible visualization support (and 3rd party downloadable visualizations)
- headset support, automatic Resume on headset and/or BT connection
- scrobbling
- tag editor
- V3 adds audio info with detailed audio processing information
- ultra fast library scan
- high level of customization via settings

This version is 15 days full featured Trial. See Related Apps for Poweramp Full Version Unlocker or use Buy option in Poweramp settings to buy the Full Version.

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Common Questions/Answers for Poweramp:
Q. Does my Poweramp v2 purchase include Poweramp v3?
A. Yes, it does.

Q. How do I disable visualization?
A. It's disabled by default, can be enabled/disabled by first left button right under cover.

Q. Seekbar? Titles on cover? Other UI tweaks?
A. Please use settings / Look and feel / Skin and set built-in skin options as needed.

Q. My songs are missing from folders/library/playlists.
A. Please ensure you have all your folders with music actually checked in Poweramp settings/ Library / Music Folders.

Q. Amplified basses are distorted over Bluetooth.
A. For really deep basses over bluetooth, disable Bluetooth Absolute Volume in Developer options (or device Sounds settings, depending on device/Android).