The draft mode allows for quicker turn-around, perhaps in real time, but will not have the full quality of the production mode. Often a composer or virtual conductor will want a "draft mode" for initial score editing and then use the "production mode" to generate high-quality sound as one gets closer to the final version. Some are specifically designed to mimic real-world instruments such as pianos. Sample libraries may be many gigabytes in size. Some softsynths are sample-based, and frequently have more capability than hardware units, since computers have fewer restrictions on memory than dedicated hardware synthesizers. Gforce produces a Minimoog with sounds designed by Rick Wakeman and version of the ARP Odyssey. Software Synth developers such as Arturia offer virtual editions of analog synths like the Minimoog, the ARP 2600, as well as the Yamaha CS-80. Popular synthesizers such as the Moog Minimoog, Yamaha DX7, Korg M1, Sequential Prophet-5, Oberheim OB-X, Roland Jupiter 8, ARP 2600 and dozens of other classics have been recreated in software. Some simulators can even import the original sound patches with accuracy that is nearly indistinguishable from the original synthesizer.
The emulation can even extend to having graphics that model the exact placements of the original hardware controls. Many popular hardware synthesizers are no longer manufactured but have been emulated in software. Softsynths can cover a range of synthesis methods, including subtractive synthesis (including analog modeling, a subtype), FM synthesis (including the similar phase distortion synthesis), physical modelling synthesis, additive synthesis (including the related resynthesis), and sample-based synthesis.