UPDATE: At this point we don’t just think an RP is a “pretty good audio interface”; it’s the one we use for harmonica whenever we have the chance. See this post for a discussion of how we recorded a session for the big-budget BBC series “Copper” using our Digitech RP255 as the computer audio interface. Click here for samples from the tracks we recorded for a country-western artist in September 2015 using our Digitech RP360XP for the computer audio interface. Did I mention that I recorded the harmonica tracks for an ESPN documentary at my kitchen table in Idaho using an RP355 in December 2014?
So: now you can read the piece below, which describes our first experience with the RP as a computer audio interface. (Necessity is indeed the mother of invention. One of the mothers, anyway, and of course there are fathers too. And sisters, brothers, etc., but simple metaphors work better than complex ones.)
I was on the road this week (Note: July 21 2011), and I planned to record a session I’ve been hired to do, working in my hotel room, which is something I’ve done before with good results. Not so good this time. I’ve just switched to a new laptop running Windows 7; my old laptop ran Windows XP. It turned out that a Windows 7 driver is not available for the Tascam US-122, the audio interface I used with the old laptop. I discovered this when I tried to set up the Tascam with the new computer. I also tried my Zoom H4, which I had with me and which is also an audio interface, and that worked but sounded awful and had a lot of latency.
So I figured I had to get a new audio interface. There are lots of 16-bit USB audio interfaces with built in mic preamps available for less than $100, but 16 bit recording doesn’t sound very good to me–the noise floor is just too high. Then I remembered that the Digitech RPs from the 150 on function as a 24-bit 44.1 kHz audio interface. I had already installed the drivers for all my RPs, so I plugged my RP255 in via USB and started Sonar, my audio workstation.
What do you know: it works really well. The sound is very clear, with good level, when I record using the Fireball V mic and the Direct amp and cabinet models. I can adjust the recorded signal level easily using the Master Volume control, and I can monitor easily using the built in headphone jack. Latency is low too at 11.5 milliseconds, which is roughly the equivalent of the delay that you get when you play into a mic standing 11 feet away. And of course, if I wanted to record something with a big amped up sound, the RP255 would do that too.
The big amped sounds are really easy; the hard thing is to get a great clean sound that works on its own before you put the dirt on. The Direct model does that very nicely, and when you cup the harp in your hands with a clean mic like the Audix Fireball, you get a lovely harmonica sound from which the room sound is completely absent. That’s REALLY important when you’re trying to do usable tracks in a hotel room or a kitchen. The RP255 also has a Digitech Clean amp model that I’d like to try sometime. An RP350 or 355 has a Clean Tube preamp model, and that is something I want to try for sure. And I’d like to see what it sounds like when I hit Bypass. In the meantime, it’s nice to know that when Digitech said this thing was an audio interface, they meant it. If you own an RP and you’re thinking of getting into computer recording, you’ve already got the interface.
If you liked that, you’ll like these:
the 21st century blues harmonica manifesto in sound
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the rock harmonica masterpiece
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