Registering this code on the AAS web site prompts a 'response' code by return email. When the program is first run, entering your serial number generates a 'challenge' code. 'Less than 12MB to download, seconds to install' says the promotional blurb, and I can't argue with that - apart from the fact that the Windows version is a mere 6.9MB! Indeed, if you buy Strum directly from the AAS web site shop it is available only as a download - although boxed versions are available from their distributors. One of the immediate benefits of virtually modelled instruments is their scant size, since there are no bloated sample libraries involved. It is from the last of these that Strum presumably takes its inspiration. This is not altogether surprising, since Applied Acoustics Systems are purveyors of other well-known physically modelled instruments such as the Tassman modular synth, Ultra Analogue synth, Lounge Lizard electric piano and String Studio string modelling synth. However, unlike the Steinberg and Musiclab instruments, which are wholly sample-based, the sounds produced by Strum are physically modelled, having never been anywhere near a microphone, a plectrum or a can of Fast Fret.

Like Real Guitar, the PC- and Mac-compatible Strum is dedicated to emulating acoustic guitars. Of these, Musiclab's products are designed to allow for spontaneous real-time 'strumming' by the player, and it is with this same aim in mind that AAS have designed their Strum GS1 software.

Steinberg started the ball rolling with Virtual Guitarist in 2002, followed by Musiclab's Real Guitar in 2004 and Real Strat in 2007. Musicians who work to short-notice deadlines and non-existent budgets (and those of us who delight in techno toys) may therefore be intrigued by the latest aid in the quest to tackle the problem of simulating the most difficult technique to reproduce on a keyboard: strumming. The continuing determination of software developers to virtualise the real world can be seen as either a blessing or a curse, depending upon the perceived benefits such inventions may offer to your particular field of interest. Fed up with guitarists? Overwhelmed by huge sample libraries? Just plain disappointed with your own ham-fisted guitar skills? AAS's Strum Acoustic GS1 could be right up your street.

Aas strum gs 2