Thirteen years passed between Drukqs and Syro, the fifth and sixth Aphex Twin albums.

The long stretch, however, wasn't short on new material from Richard D.

James.

From 2005 through early 2014, the frequently dazzling Analord EPs (all but one of which was credited to AFX), an EP and LP as the Tuss, and a liberated Caustic Window LP all reached the public.

In August 2014, a nylon Aphex blimp -- not quite as immense as the S.O.S.

Band's presumably decommissioned aircraft, yet transfixing nonetheless -- was spotted over London, and the following month, Syro arrived on Warp.

Low on frenetics, Syro is anchored by rotund and agile basslines that zip and glide, and it's decked in accents and melodies that are lively even at their most distressed.

It also flows easily, a notion epitomized by the sequencing of "XMAS_EVET10 [Thanaton3 Mix]" and "Produk 29," where a mesmerizing combination of snaking low-end synthesizers (10:31, not 12:24 in length) is trailed by an avant-rap body mover that bears some resemblance to Dabrye's lithe and sprightly early releases.

Components of certain tracks, like the squiggled Mr.

Fingers spin-cycle bassline in "4 bit 9d api+e+6" and scrambled rhythms of "CIRCLONT6A [Syrobonkus Mix]," make the album seem like a bright progression from the Analord releases.

Apart from the straight-ahead slamming drums in "180db_," the most striking aspect of Syro is the funkiness of its synthesizers relative to James' previous output.

His playing here is far too fidgety to be grafted onto the likes of "You Dropped a Bomb on Me," "You're the One for Me," and "Just Be Good to Me," though some of the lines in, uh, the title cut, have that grimace-triggering quality.

Only a trace of the indiscriminate sequencing and stylistic switch-ups heard on Drukqs remains.

It's saved for the end, with a rather elegant, part-drum'n'bass excursion as the penultimate number, followed by a placid piano-only piece in the vein of those heard on the 2001 album.

These tracks actually enhance, rather than hinder, one of James' most inviting and enjoyable releases.