James-F wrote on 2017-05-01, 08:30:
"Headroom.mid" will play a bunch of notes together to reach maximum volume where the SC-55 clips internally before the volume co […]
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"Headroom.mid" will play a bunch of notes together to reach maximum volume where the SC-55 clips internally before the volume control.
I found that SC-VA and SC-55 have the exact same headroom amount when matched using "Sine Mono.mid", they both clip at the same volume.
SC-VA clips at -0.1dbFS which is the maximum volume of the digital domain, and SC-55 will clip at -0.5dB at the inputs of the audio interface (mixer) while not clipping the inputs.
So once again, Roland did a fantastic job with SC-VA.
Are you sure about all that? Headroom.mid doesn't clip anything "internally" for me on my SC-55 pre-volume control, but it's actually a useful way to calibrate the volume control to ensure there's no distortion in the analog output stage. I need to keep volume knob at about 11 hour, otherwise I can clearly hear some fuzz/crackling type distortion when playing headroom.mid.
Verified with this with some "loud" MIDI files, e.g. Shadow Warrior:
It's not really audible btw, even with max volume, but it definiltey shaves of the transients as you can see. I guess it sounds a bit "rounder" with the slight fuzz/overdrive, but I'll keep the volume at 11'o clock myself at all times.
I'm not sure about the clipping behaviour you've experienced with the SCVA either. I don't think it does any "analog modeling", it seem to be just doing float calculations, and I'm not able to overload / drive it into clipping or distortion however hard I'm trying (in REAPER, using a full 32-bit float mixing path). The weird dithering distortion (or lack of dithering, perhaps) on the reverb tails is definitely not there with the SCVA that is present on the SC-55 (although it's emulating the 8820, so probably that doesn't suffer from this low-level dithering problem).
In any case, thanks for the test tones, they're handy 😀
DOS: Soyo SY-5TF, MMX 200, 128MB, S3 Virge DX, ESS 1868F, AWE32, QWave, S2, McFly, SC-55, MU80, MP32L
Win98: Gigabyte K8VM800M, Athlon64 3200+, 512MB, Matrox G400, SB Live
WinXP: Gigabyte P31-DS3L, C2D 2.33 GHz, 2GB, GT 430, Audigy 4