[AudioI] AudioInjector and Guitar

Joseph DiVerdi joseph.diverdi at colostate.edu
Mon Feb 21 16:01:59 UTC 2022 

Jonathan, in my case I have a couple of ideas and a lot of questions that I hope to answer with some experimentation.

I've been a (mediocre) bass guitarist for many years and have gravitated towards electronic modification of sound. So the electronics I took the trouble to install in the guitar are intended for real time performance tone adjustment. I'm also an electronics enthusiast who likes to build things and this is a great excuse to do so.

The ultra audio injector and the raspberry pie are a bit more adventurous. I'm interested in using the program sonic pie to synthesize sounds that can accompany the guitar playing. I am also hoping to be able to "loop close ", that's recording some Live sounds and playing them back immediately while accompanying them with more live guitar playing perhaps recursively several times.

Matt's products can be used for audio recording, audio playback and audio synthesis. They can be used for sub-audio purposes but that is not my interest at this time and place. Hope this all helps explain what I'm up to.

Joseph

> On Feb 20, 2022, at 6:09 PM, JONATHAN RIZZO via People <people at lists.audioinjector.net> wrote:
> 
> ** Caution: EXTERNAL Sender **
> 
> Hi All,
> 
> I’m just curious, what are these guitar projects for? Is the Pi being used to record these signals?
> 
> The reason I ask is because I use Matt’s products for very low frequency radio signals.
> 
> Thanks
> 
> Jonathan
> 
>> On Feb 20, 2022, at 6:28 PM, Joseph DiVerdi via People <people at lists.audioinjector.net> wrote:
>> 
>> Similarly, I can mention https://nam10.safelinks.protection.outlook.com/?url=https%3A%2F%2Fwww.muzique.com%2F&data=04%7C01%7Cjoseph.diverdi%40colostate.edu%7C945930161d8f493f80fc08d9f4d69473%7Cafb58802ff7a4bb1ab21367ff2ecfc8b%7C0%7C0%7C637810025673723173%7CUnknown%7CTWFpbGZsb3d8eyJWIjoiMC4wLjAwMDAiLCJQIjoiV2luMzIiLCJBTiI6Ik1haWwiLCJXVCI6Mn0%3D%7C3000&sdata=NhI9bjfdagPHIeZgM6t48VjYHMpgpxkMTTsncIiCYlU%3D&reserved=0 which is a pretty broad and perhaps a bit cluttered assortment of the electronic side of electronic musical instruments (broadly defined). It is but one of a number of sites like it which vacillate between home-builders and buyers. Many are pretty old (both the site and the author). This analog stuff enjoyed a real lift-off (if that is the proper term) starting in the late 1960s with a heyday in the 1970s. j
>> 
>>>> On Sun, 20 Feb 2022 4:19 PM, hugh crawford wrote:
>>> Forgot to mention this
>>> https://nam10.safelinks.protection.outlook.com/?url=https%3A%2F%2Fwww.guitarfetish.com%2FNeovin-Active-PreampEQ_c_147.html&data=04%7C01%7Cjoseph.diverdi%40colostate.edu%7C945930161d8f493f80fc08d9f4d69473%7Cafb58802ff7a4bb1ab21367ff2ecfc8b%7C0%7C0%7C637810025673723173%7CUnknown%7CTWFpbGZsb3d8eyJWIjoiMC4wLjAwMDAiLCJQIjoiV2luMzIiLCJBTiI6Ik1haWwiLCJXVCI6Mn0%3D%7C3000&sdata=KKxLPCAIYrAKqZ%2FlpM7Cyxy1DwRY5%2FH3Mo9CE7bVafc%3D&reserved=0 <https://nam10.safelinks.protection.outlook.com/?url=https%3A%2F%2Fwww.guitarfetish.com%2FNeovin-Active-PreampEQ_c_147.html&data=04%7C01%7Cjoseph.diverdi%40colostate.edu%7C945930161d8f493f80fc08d9f4d69473%7Cafb58802ff7a4bb1ab21367ff2ecfc8b%7C0%7C0%7C637810025673723173%7CUnknown%7CTWFpbGZsb3d8eyJWIjoiMC4wLjAwMDAiLCJQIjoiV2luMzIiLCJBTiI6Ik1haWwiLCJXVCI6Mn0%3D%7C3000&sdata=KKxLPCAIYrAKqZ%2FlpM7Cyxy1DwRY5%2FH3Mo9CE7bVafc%3D&reserved=0>
>>> The guitarfetish site is sort of an uninformative mess, but Googling the products will turn up their old more descriptive web pages.
>>>> On Sun, Feb 20, 2022 at 2:59 PM Joseph DiVerdi <diverdi at xtrsystems.com <mailto:diverdi at xtrsystems.com>> wrote:
>>>   I have some of this kind of work on my website. Here is an example of an amplifier (and much more) I installed in a bass guitar including (relevant to this discussion) a pickup amplifier and final low impedance output buffer which is capable of driving looong cable lengths with high fidelity. The guitar details can be found at <https://nam10.safelinks.protection.outlook.com/?url=http%3A%2F%2Fxtrsystems.com%2Fmusic%2F20201222%2520bass%2520guitar%2F20201222%2520bass%2520guitar.pdf&data=04%7C01%7Cjoseph.diverdi%40colostate.edu%7C945930161d8f493f80fc08d9f4d69473%7Cafb58802ff7a4bb1ab21367ff2ecfc8b%7C0%7C0%7C637810025673723173%7CUnknown%7CTWFpbGZsb3d8eyJWIjoiMC4wLjAwMDAiLCJQIjoiV2luMzIiLCJBTiI6Ik1haWwiLCJXVCI6Mn0%3D%7C3000&sdata=tNNzntfqUn%2FW1K%2FhC%2FUGFYpUYG8zpeLi6wLf5aGaBwI%3D&reserved=0 <https://nam10.safelinks.protection.outlook.com/?url=http%3A%2F%2Fxtrsystems.com%2Fmusic%2F20201222%2520bass%2520guitar%2F20201222%2520bass%2520guitar.pdf&data=04%7C01%7Cjoseph.diverdi%40colostate.edu%7C945930161d8f493f80fc08d9f4d69473%7Cafb58802ff7a4bb1ab21367ff2ecfc8b%7C0%7C0%7C637810025673723173%7CUnknown%7CTWFpbGZsb3d8eyJWIjoiMC4wLjAwMDAiLCJQIjoiV2luMzIiLCJBTiI6Ik1haWwiLCJXVCI6Mn0%3D%7C3000&sdata=tNNzntfqUn%2FW1K%2FhC%2FUGFYpUYG8zpeLi6wLf5aGaBwI%3D&reserved=0>> Other relevant items (including my planned installation of a Ultra audio-injector (another of Matt's fine products) and a raspberry-pi into a big amplifier and speaker system. One possibility for this is a Sonic-Pi application for synthesizer. Another is for looping. Big goals, limited time to work on them.
>>>   The guitar electronics were intentionally designed to operate on a single (9V) battery knowing full well there would be some power on/off transients (clicks). This was a prototype project (perhaps "throw away"). Two batteries would help or a negative rail DC generator. One of the helpful aspects is that the line voltage output is so high that I had to construct an in-line 10x attenuator that sits at the amplifier input (helping control line impedance and minimizing frequency roll-off, reducing line noise and the on/off transients).
>>>   I'm happy to discuss electronic circuit design in this context or others. I have been doing this stuff for many years and enjoy sharing the experiences.
>>>   Joseph
>>>   On Sun, 20 Feb 2022 3:42 PM, Matt Flax via People wrote:
>>>> *** Caution: EXTERNAL Sender ***
>>>> 
>>>> Do you know any circuits online of guitar preamps which are known good ?
>>>> 
>>>> One idea is to design one up - possibly using the Pro soundcard first - because of its available power rails and low noise design and the AIABS inteface which would make it reusable.
>>>> 
>>>> We could work through the design of a preamp there seems to be some interest.
>>>> 
>>>> Matt
>>>> 
>>>> On 21/2/22 09:37, hugh crawford wrote:
>>>>> I was really excited to see this because I thought maybe somebody had figured it out. Imagine my disappointment to see that it was pointing back to me. I have not actually figured this out. I am dealing with six extremely low power output single coil pickups and the noise is six times worse than one would get from a regular setup so it’s sort of worst case scenario here.
>>>>> 
>>>>> I am also building the actual guitar so I have been occupied with a multitude of other problems.
>>>>> 
>>>>> Some ideas that I am considering but have not yet tried are to run the guitar signal through some sort of effects box, a booster for instance, that will do impedance matching and deliver a more useful signal to the audioinjector.
>>>>> 
>>>>> In my case I’m thinking of trying six cheapish noise gates since hardly ever am I playing all six strings at once.
>>>>> 
>>>>> Another idea involves using a high impedance Phono preamp as a buffer.
>>>>> 
>>>>> My advice would be to build your device, then if necessary visit your friendly guitar store and try out different stomp boxes as buffers. That’s what I plan to do soon now that they are open to in person business.
>>>>> 
>>>>> On Sun, Feb 20, 2022 at 1:46 PM Matt Flax via People <people at lists.audioinjector.net <mailto:people at lists.audioinjector.net>> wrote:
>>>>> 
>>>>>    Hi Harold,
>>>>> 
>>>>> 
>>>>>    Some people in the past have build guitar rigs, there is most likely good information here :
>>>>> 
>>>>> https://nam10.safelinks.protection.outlook.com/?url=https%3A%2F%2Flists.audioinjector.net%2Fpipermail%2Fpeople%2F2020-December%2F000157.html&data=04%7C01%7Cjoseph.diverdi%40colostate.edu%7C945930161d8f493f80fc08d9f4d69473%7Cafb58802ff7a4bb1ab21367ff2ecfc8b%7C0%7C0%7C637810025673723173%7CUnknown%7CTWFpbGZsb3d8eyJWIjoiMC4wLjAwMDAiLCJQIjoiV2luMzIiLCJBTiI6Ik1haWwiLCJXVCI6Mn0%3D%7C3000&sdata=cwPbsLNg8c3r%2FWdTDaC79%2FMa0yigVDfX%2BpOitstZIYY%3D&reserved=0 <https://nam10.safelinks.protection.outlook.com/?url=https%3A%2F%2Flists.audioinjector.net%2Fpipermail%2Fpeople%2F2020-December%2F000157.html&data=04%7C01%7Cjoseph.diverdi%40colostate.edu%7C945930161d8f493f80fc08d9f4d69473%7Cafb58802ff7a4bb1ab21367ff2ecfc8b%7C0%7C0%7C637810025673723173%7CUnknown%7CTWFpbGZsb3d8eyJWIjoiMC4wLjAwMDAiLCJQIjoiV2luMzIiLCJBTiI6Ik1haWwiLCJXVCI6Mn0%3D%7C3000&sdata=cwPbsLNg8c3r%2FWdTDaC79%2FMa0yigVDfX%2BpOitstZIYY%3D&reserved=0>
>>>>> 
>>>>> https://nam10.safelinks.protection.outlook.com/?url=http%3A%2F%2Fforum.audioinjector.net%2Fviewtopic.php%40t%3D5797.html&data=04%7C01%7Cjoseph.diverdi%40colostate.edu%7C945930161d8f493f80fc08d9f4d69473%7Cafb58802ff7a4bb1ab21367ff2ecfc8b%7C0%7C0%7C637810025673723173%7CUnknown%7CTWFpbGZsb3d8eyJWIjoiMC4wLjAwMDAiLCJQIjoiV2luMzIiLCJBTiI6Ik1haWwiLCJXVCI6Mn0%3D%7C3000&sdata=EWwCsSx3gkronXV2Hg7j%2BhKjxstKHCJQbep6pnjydAc%3D&reserved=0 <https://nam10.safelinks.protection.outlook.com/?url=http%3A%2F%2Fforum.audioinjector.net%2Fviewtopic.php%40t%3D5797.html&data=04%7C01%7Cjoseph.diverdi%40colostate.edu%7C945930161d8f493f80fc08d9f4d69473%7Cafb58802ff7a4bb1ab21367ff2ecfc8b%7C0%7C0%7C637810025673723173%7CUnknown%7CTWFpbGZsb3d8eyJWIjoiMC4wLjAwMDAiLCJQIjoiV2luMzIiLCJBTiI6Ik1haWwiLCJXVCI6Mn0%3D%7C3000&sdata=EWwCsSx3gkronXV2Hg7j%2BhKjxstKHCJQbep6pnjydAc%3D&reserved=0>
>>>>> 
>>>>> 
>>>>>    You can also contact those people directly if you don't get a response here.
>>>>> 
>>>>> 
>>>>> 
>>>>>    Matt
>>>>> 
>>>>> 
>>>>>    On 20/2/22 07:02, Harold Désert-Legendre via People wrote:
>>>>>>    Hello Audioinjector Users,
>>>>>> 
>>>>>>    I bought the audioinjector soundcard (stereo in/out via rca connectors) in order to build a guitar looper pedal. Will I need to adjust the guitar signal in term of gain? Or Can I directly plug the guitar  into the soundcard (just physically transforming jack into rca).
>>>>>> 
>>>>>>    If anyone has experience with it, thanks for sharing your feedbacks!
>>>>>> 
>>>>>>    Regards,
>>>>>> 
>>>>>>    Harold
>>>>>> 
>>>>>    --
>>>>>    Checkout the community email list :
>>>>> https://nam10.safelinks.protection.outlook.com/?url=https%3A%2F%2Flists.audioinjector.net%2Fmailman%2Flistinfo%2Fpeople&data=04%7C01%7Cjoseph.diverdi%40colostate.edu%7C945930161d8f493f80fc08d9f4d69473%7Cafb58802ff7a4bb1ab21367ff2ecfc8b%7C0%7C0%7C637810025673723173%7CUnknown%7CTWFpbGZsb3d8eyJWIjoiMC4wLjAwMDAiLCJQIjoiV2luMzIiLCJBTiI6Ik1haWwiLCJXVCI6Mn0%3D%7C3000&sdata=p9k4vEzsCZoSLTNs5xL%2BKxJDUT3FY6wwVX3LNej7Xdw%3D&reserved=0 <https://nam10.safelinks.protection.outlook.com/?url=https%3A%2F%2Flists.audioinjector.net%2Fmailman%2Flistinfo%2Fpeople&data=04%7C01%7Cjoseph.diverdi%40colostate.edu%7C945930161d8f493f80fc08d9f4d69473%7Cafb58802ff7a4bb1ab21367ff2ecfc8b%7C0%7C0%7C637810025673723173%7CUnknown%7CTWFpbGZsb3d8eyJWIjoiMC4wLjAwMDAiLCJQIjoiV2luMzIiLCJBTiI6Ik1haWwiLCJXVCI6Mn0%3D%7C3000&sdata=p9k4vEzsCZoSLTNs5xL%2BKxJDUT3FY6wwVX3LNej7Xdw%3D&reserved=0>
>>>>> 
>>>>> 
>>>>>    --
>>>>>    People mailing list
>>>>> People at lists.audioinjector.net <mailto:People at lists.audioinjector.net>
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>>>>> 
>>>> --
>>>> Checkout the community email list :
>>>> https://nam10.safelinks.protection.outlook.com/?url=https%3A%2F%2Flists.audioinjector.net%2Fmailman%2Flistinfo%2Fpeople&data=04%7C01%7Cjoseph.diverdi%40colostate.edu%7C945930161d8f493f80fc08d9f4d69473%7Cafb58802ff7a4bb1ab21367ff2ecfc8b%7C0%7C0%7C637810025673723173%7CUnknown%7CTWFpbGZsb3d8eyJWIjoiMC4wLjAwMDAiLCJQIjoiV2luMzIiLCJBTiI6Ik1haWwiLCJXVCI6Mn0%3D%7C3000&sdata=p9k4vEzsCZoSLTNs5xL%2BKxJDUT3FY6wwVX3LNej7Xdw%3D&reserved=0 <https://nam10.safelinks.protection.outlook.com/?url=https%3A%2F%2Flists.audioinjector.net%2Fmailman%2Flistinfo%2Fpeople&data=04%7C01%7Cjoseph.diverdi%40colostate.edu%7C945930161d8f493f80fc08d9f4d69473%7Cafb58802ff7a4bb1ab21367ff2ecfc8b%7C0%7C0%7C637810025673723173%7CUnknown%7CTWFpbGZsb3d8eyJWIjoiMC4wLjAwMDAiLCJQIjoiV2luMzIiLCJBTiI6Ik1haWwiLCJXVCI6Mn0%3D%7C3000&sdata=p9k4vEzsCZoSLTNs5xL%2BKxJDUT3FY6wwVX3LNej7Xdw%3D&reserved=0>
>>>> 
>>>> 
>>>> 
>>>   --     Joseph A. DiVerdi, PhD, MBA
>>>   XTR Systems, LLC
>>>   ChemIntelligence for Hemp & Cannabis
>>>   +1.970.980.5868 - https://nam10.safelinks.protection.outlook.com/?url=http%3A%2F%2Fwww.xtrsystems.com%2F&data=04%7C01%7Cjoseph.diverdi%40colostate.edu%7C945930161d8f493f80fc08d9f4d69473%7Cafb58802ff7a4bb1ab21367ff2ecfc8b%7C0%7C0%7C637810025673723173%7CUnknown%7CTWFpbGZsb3d8eyJWIjoiMC4wLjAwMDAiLCJQIjoiV2luMzIiLCJBTiI6Ik1haWwiLCJXVCI6Mn0%3D%7C3000&sdata=Cunudom3xAvdjTpEQPExEi%2Bn5q6kA2ZDbVn5ehkXw44%3D&reserved=0 <https://nam10.safelinks.protection.outlook.com/?url=http%3A%2F%2Fwww.xtrsystems.com%2F&data=04%7C01%7Cjoseph.diverdi%40colostate.edu%7C945930161d8f493f80fc08d9f4d69473%7Cafb58802ff7a4bb1ab21367ff2ecfc8b%7C0%7C0%7C637810025673723173%7CUnknown%7CTWFpbGZsb3d8eyJWIjoiMC4wLjAwMDAiLCJQIjoiV2luMzIiLCJBTiI6Ik1haWwiLCJXVCI6Mn0%3D%7C3000&sdata=Cunudom3xAvdjTpEQPExEi%2Bn5q6kA2ZDbVn5ehkXw44%3D&reserved=0>
>>>   us02web.zoom.us/j/9460709393 <https://nam10.safelinks.protection.outlook.com/?url=http%3A%2F%2Fus02web.zoom.us%2Fj%2F9460709393&data=04%7C01%7Cjoseph.diverdi%40colostate.edu%7C945930161d8f493f80fc08d9f4d69473%7Cafb58802ff7a4bb1ab21367ff2ecfc8b%7C0%7C0%7C637810025673723173%7CUnknown%7CTWFpbGZsb3d8eyJWIjoiMC4wLjAwMDAiLCJQIjoiV2luMzIiLCJBTiI6Ik1haWwiLCJXVCI6Mn0%3D%7C3000&sdata=hQjVltku6w1faj6BB8pC%2BObNIa5UmzOMs0Oqf19umnA%3D&reserved=0>
>> 
>> 
>> --
>> Joseph A. DiVerdi, PhD, MBA
>> XTR Systems, LLC
>> ChemIntelligence for Hemp & Cannabis
>> +1.970.980.5868 - https://nam10.safelinks.protection.outlook.com/?url=http%3A%2F%2Fwww.xtrsystems.com%2F&data=04%7C01%7Cjoseph.diverdi%40colostate.edu%7C945930161d8f493f80fc08d9f4d69473%7Cafb58802ff7a4bb1ab21367ff2ecfc8b%7C0%7C0%7C637810025673723173%7CUnknown%7CTWFpbGZsb3d8eyJWIjoiMC4wLjAwMDAiLCJQIjoiV2luMzIiLCJBTiI6Ik1haWwiLCJXVCI6Mn0%3D%7C3000&sdata=Cunudom3xAvdjTpEQPExEi%2Bn5q6kA2ZDbVn5ehkXw44%3D&reserved=0
>> us02web.zoom.us/j/9460709393
>> 
>> --
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> 
> 
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