Between the success of "The Sing-Off" and "Pitch Perfect," it's fair to say that A capella is making a definite comeback. Pentatonix, a five-piece vocal group, fresh off their well-attended European tour, has been reaping the benefits of the increased interest. They've already garnered 4.5 million subscribers and 300 million views on their YouTube channel and a Top 10 album with "PTX Volume 2"; sold out their entire North American tour, which runs from February 4 to March 9; collaborated with Lucky Charms cereal on its 50th anniversary commercial, which premieres during CBS's 2014 Grammy broadcast; and are set to appear on "Sesame Street" on February 7. Download.com chatted with the quintet's tenor, Mitch Grassi about A capella, electronic music, social media, and his favorite apps.

A capella-lypse: Pentatonix (with Mitch Grassi: front) destroying overly produced music one note at a time.

What do you have to do to prepare for this tour? Well, actually we were just preparing, because we've done the same set list for a year and a half now, and we want to bring something new to the table. As far as prep, we're just getting ready to feel the jet lag and language barriers. But we're looking at it in a positive light, because it's going to be incredible.

Photoshop Express for Android now has sliders to fine-tune a variety of editing settings. A new rendering engine improves performance during the editing and can load larger images. (Click to enlarge.)

Adobe Systems released a new version of its Photoshop Express for Android app Thursday that brings optimizations for Android 4.4 KitKat, new editing options, more direct to effects filters, and a new engine for processing photos.

"We have made every effort to fine-tune the app for Android. As an example, Android users will appreciate accessing and processing images saved on the SD card faster than before," Adobe's Manu Anand said in a blog post Thursday.

The new Android app includes a new image-rendering engine for handling photos. "This engine greatly improves performance and enables handling of large file sizes," Adobe said.

The company also added integration with Revel, its service for syncing photos across devices -- though all you can do is upload photos to Revel or download them for editing. There's no ability to sor... [Read more]