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New features galore in this latest modelling champ

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"This level of customisation is made manageable by the larger LCD, which aids navigation. We wanted to come up with a way of keeping it simple for the guys who just want to plug in and get a great sound, while offering gigging players a way of dialing in exactly what they want."

Alongside the familiar wealth of modulations, reverbs and delays are new options such as Pitch Glide, a whammy-style effect and Smart Harmony – Line 6's first foray into the murky world of real time guitar harmony. There's a Looper too, mooted as the most guitarist-friendly yet, and we've checked that out in the video demo.

We've always admired the concept of including artist-specific presets designed by the players themselves and it seems that, even here, Line 6 has upped the ante. One of the most surprising inclusions for us was that of Johnny Marr, a dyed-in-the-wool old-school gear head. "Johnny has used a lot of our stuff including PODs and, most recently, Spider Valves," Waara says proudly. "He was making an album in LA this spring, and we ended up going over to the studio several times."

There are now over 300 presets provided by 50 or so artists – 25 of which are newcomers to Spider IV. "For the artist preset process," continues Waara, "we take amps to folks, send them out on the road with them, and try to grab them when they're playing locally. We ask them to make presets that make them happy, and ones they think their fans will enjoy and expect."

That's most of the theory and science dealt with. But can it live up to the hype?

Sounds

The final frontier of a digital amp is indeed how it feels when compared to the amps being modelled. A 'real' valve amp's tonal idiosyncrasies are one thing, but the feel is quite another, and extremely difficult to recreate digitally. It's here where amps such as this new Spider IV will stand or fall.

Ultra cleans and mega filth sounds are usually up to snuff, but kudos goes to Line 6 for the sound and feel of the light break-up to medium-gain tones in the Spider IV. For example, the red option of the Blues model – based on a 1953 wide-panel Deluxe – both sings and blooms like Katherine Jenkins in a field full of daffodils.

Likewise the Class A and Twang modes offer more usable and satisfying tones for sensible home use than all manner of small-wattage, all-valve beasties. Editing is a doddle once you're up to speed with the processes (as ever, don't forget to save), and even the 14-second looper function is intuitive, engaging and, most importantly, very simple to use.

Perhaps basing the Red Clean model on the Marshall JCM900 – an amp hardly lauded for its sparkling cleans – might prove to be something of a miscalculation, but the truth is that it sounds good nonetheless. It highlights the fact that preconceptions aren't a great deal of use when it comes to getting sounds – just use your ears and don't worry too much about the names!

Getting the most from the myriad artist tones can depend on your familiarity with the name in question, but it's a sour player indeed who doesn't sport a huge grin when, for example, knocking out the riff to Brown Sugar using that specific preset. While we're on the subject, Johnny Marr's quartet of presets are great too.

There's no discernible delay between switching tonally contrary sounds, even though you'll need to shell out for either of the footswitches to do this onstage. From warm cleans and fruity crunches all the way to skull-crushing metal explosions, the Spider IV is the best sounding of the series so far.

To conclude our chat, we ask Scott about the possibility of Spider V? "Who knows? Maybe Spider IV is the last amp you'll ever need," he tells us with a smile. It's clearly the latest in a long line of learning for Line 6 – if you haven't played a digital amp in a while (or indeed never) make sure you try this. It's the most advanced and authentic sounding Spider yet.

Line 6 doesn't pretend that dialing in, for example, the Twang setting is absolutely the equal of a '65 Fender Twin – of course it's not – but it is certainly close enough for players who don't live or die by that sound, whether at home, in the studio or for rehearsing. Users of big, quality valve amps won't be convinced for live use, but if you want to continue to drag numerous amps around with you, you go ahead!

Good tones, great price and with the facility to upgrade the firmware, now is the time to try – and be thoroughly impressed by – the Spider IV. The gap is closing…