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Messages - bobhill

#16
I don't mean to sound curt with my above response, so I will try to explain my feelings about modeling amps and pedals.

Like Enzo, Roly, Juan  and a few others on this board, I am an older player (Medicare next month :( ) with going on 50 years of playing with just about any type of rig I have ever dreamed of playing, from small amps up to Marshall Superleads' back in the 70's, but have pretty much stuck with Fender amps the last couple of decades ever since my hearing could no longer take the SPL from the bands I played in back then. Think of 110+ db stage levels four or more times a week for several years. This was before hearing protection became common, and like a lot of players from that time period I do have tinnitus as a result.

My current collection has three Fender SS amps and a pair of old Blackface Fender Bandmasters. I have quite a few pedals in my collection (20+), the majority that I have built myself. I use these to modify the guitar signal to produce whatever tones I am looking for out of the amps, but will usually use no more than three to five of them at any one time, something you will find with researching various pro rigs is pretty common. Unless you are Frank Marino, that is. ;) With my rigs, I can produce the same sounds whether I am using SS or tubes for the amplification. It really doesn't matter to me.

I have tried out several of the Guitar processors that are on the market, and in my opinion (and that is my opinion, does not apply to anyone else) all of them suffer from a common fault. They all try to do everything and as a result they only achieve a certain level of mediocrity with nothing really standing out. I would much rather have them try to do just a few things and do those really well. Speaker and cab sims are really the weakest thing that modeling amps and processors try to do and fail to achieve. They may sound OK at low levels, but that does not scale at all well to gig levels. Think of it like a home stereo with the loudness button engaged at low levels to compensate for low base and high end. Works well at low levels but sounds like crap when the volume is pushed. Psycho acoustics comes into play whenever an instrument amp is pushed to the level where you are feeling the sound as well as hearing it.

I think that with the exception of AX-Fx, you will find that modeling amps and pedals are confined pretty much to the low end of the market, no matter how much power they push through however many speakers, and the resale of these amps kind of show that.

I do wish you luck with your endeavor, but expect to spend hundreds, if not thousands of hours and the money that entails in the programming of the dsp's and processors needed for the project. Then figure just what will be required to break into a market already dominated by the Line 6's, Boss, Digitech, Crate and others to get a small piece of that market. Admittedly, the beginner end of the market is the largest section of that market, but expect to have to produce a product that appeals to that segment of the market. And be prepared to make that product cheaply as a result for those beginners, as unless you are able to come up with something really outstanding, it will be hard to even get them into the local gig playing market. Forget the pros, it is hard enough to get them to use SS amps without modeling.

My suggestion would be to make your project as something that can be added to existing equipment. Looking at things from the maintenance side, there is nothing worse than a broken amp with a chip that was discontinued last year. All that can be done then is salvage the speakers, if they are worth salvaging, and the rest of it gets pitched into the landfill. That does not make the customer very eager to get your replacement product. Use common off the shelf components and keep as much of the programming off chip if possible, that way allows future improvements without having to pitch the previous generation. Look at the plug-ins available for DAWs for recording as an example.

I wish you luck in breaking into a rather small vertical market (figure less then 1% of the consuming population) that is becoming dominated by low end gear from China. You are entering the right end of the market, though. The only way to really make money in the music business is to sell to musicians, not playing music.

#17
No thanks. I'll stick with my amps.
#18
Schematics and Layouts / Re: Roto effect
October 18, 2012, 08:30:05 AM
Still seems to be a lot of them on the bay, got 102 hits on the search running from about $2.50 to $20 each. A lot of them seem to be coming from China, so someone is still making them. Or at least branding them as such.
#19
Thanks, but I was just making fun of myself. If I need a bass amp I can get one very easily. ;)
#20
And as an aside note, I have looked at the Mustangs just for the recording interface, but if I add yet another amp to the five Fender amps already in the house my other half just might take exception. I hope it is not until after I somehow sneak a bass amp into the collection, but you never know...
#21
Over on Strat Talk they have a Mustang owners club, you will find a lot of information there on how the owners use them. I dare say that here you will also find a few people that have them, they just haven't spoken up yet. :)
#22
Isn't the Mustang III 100 watts into a single 12"? If you are planning on using it just in the home, you might find it a bit much unless you have very understanding people you are living with, and even more, very tolerant neighbors.  :cheesy:

I tend to agree with Phil, there are easier ways to do modeling, and offer more flexibility down the road. I do have to admit, the Mustangs I have played through I tend to set on a clean Blackface setting and use pedals to produce what I want, but my experience with them is limited, so take that for what it's worth.
#23
Schematics and Layouts / Re: Roto effect
August 18, 2012, 08:32:42 PM
Nice one, Phil. Now I just might have a use for the old Cry Baby shell I've had hanging around. That seems to be the easiest way to make it ramp up and down. Paralleling the output into LP and HP filters into stereo outs might even be a way to bring it even closer. Hmmm... gotta think on that one. Good job.
Bob
#24
Considering you are guessing that you have it turned halfway, it could be either linear or analog. What is it controlling? If it is a volume control, get an A100k replacement. If it is for a tone control, a B100k will work just fine.
#25
Hi Phil,

I think you will find that SNR problems tend to creep up more when the entire signal chain suffers from the "True Bypass" marketing bit. I know that people use pedals now a lot differently than we did back in the late 60's through the 70's before anyone decided a 1/4" piece of wire was worth many dollars retail, but I tend to use a fairly small signal chain that includes one buffered pedal at the end of the chain, so I don't get a lot of noise issues. Depending on just how many devices are chained together, it doesn't seem to get very severe. And if I have that many, it is time for subchains with a looper.

And for the record, back in the day my chain was only 5 effects, and I was considered unusual. Of those 5, only one (Craig Anderton's Fresh Fuzz) was true bypass, all the rest (Morley Power Fuzz Wa, Phase 90, Ibanez FL303 flanger and Echoplex) are all buffered or always on. Of course, all these fed into a Marshall Superlead full stack, so I may not have noticed any noise I wasn't making on purpose. :) Hey, isn't rock supposed to be loud (he said with his tinnitus in both ears). No, we didn't pay any attention to hearing protection back then either. 8) So between the Navy, 15 years of playing verrrry loud music and over three decades on a major freight railroad, well let's just say that I don't tune pianos anymore.

That is in a large part why I started building pedals, to try and recapture that sound at more reasonable levels. About the only thing I occasionally miss is being able to feel the music in the thoracic cavity as well as hear it, but I would just as soon keep the hearing I have left.

Bob
#26
The layout file named bbbv2r2layout.png
Thanks
#27
Thank you gentlemen. Coming from you, that means a lot. 8)
#28
Bass pedal (Lowered Expectations) posted in the schematic section.
#29
And a shot of the finished product...

#30
As promised yesterday, here is the bass version of the overdrive pedal I posted yesterday. http://www.ssguitar.com/index.php?topic=2679.0

A few notes on the differences between these pedals. The bass version uses green 3mm led's instead of the reds I used in the guitar version, just for the slightly higher forward voltage of the greens. With the higher output from bass pups, I just figured it would keep things from being too harshly clipped. I also went to the 4558 op-amp instead of the LM1458 I used in the guitar version because while the 1458 produced the smooth grind I was looking for in my guitars, the 4558 has a bit more harshness on the guitar, but adds that nice bit of grit to the bass.

When I was first asked to do a bass version of the pedal, I took the easy way and just recalced the filters to drop them an octave. This, while somewhat pleasing, had the same problem as most bass OD pedals on the market, as you drop down the neck, the grind disappears on the lower register. So I went back and re- did things to drop two octaves, and when I saw on the scope that clipping started at 17 hz, I plugged in the Squire P-bass and liked what I heard. Boxed it up, demoed it and had to build 10 more. :cheesy: One of my bass friends described it (Aguilar SS bass head) as giving him back the sound of an Ampeg SVT that is severely ticked off. Both it and the guitar version are in a pair of local recording studios, so I think the sound came out ok.

The PNP is the same for both versions, I've never made a layout sheet for the bass version, just scribbled the values next to the guitar layout. I've never made an off board wiring guide for either, after making close to 30 OD's of these the wiring becomes automatic, so I need to take the time to throw one together. Promises, promises. Enjoy...

Bob