It sounds like you have NOT connected the power adapter to the box to power it. The guitar sound won't be too loud as you run the hose to your mouth and pick up the sound with a microphone such as a Shure SM57 which then goes to your amplifier. Without the power adapter the internal amplifier will not produce any output.
Note that you have to have a microphone to pick up the sound. What the device does is to put your guitar sound into your mouth where you modify the resonance like when singing and then the modified sound is picked up by the microphone the hose is strapped to. I would suggest using a Shure SM57 micrcophone. Notes that your guitar sounds via the cable are NOT modified in any way, only amplified to put into the tiney speaker that drives the hose up to your mouth.
Make sure you have the correct power adapter, not a substitute. Make sure your guitar is outputing enough... You LIKELY will need a guitar that has a preamp in the guitar, (not a passive pickup guitar). This device is nothing more than a small amp that drives a speaker which the sound travels up the hose. If your guitar creates a buzzing noise, then this device will do that too... Plug a set of headphones directely into your guitar to verify the sound is clean... NOTE, only one side of headphone will have guitar in it if the headphones are stereo type.
You are probably very near a powerful AM transmitter. This is a shielding problem and use of a better quality audio cable between the keyboard and the Talk Box might help as well as CHANGING the length of the cord. Length afects how good an antenna the cord is.
One could put a bypass capacitor in the Talk Box as what you are hearing is "rectification" of the radio station in the high gain of the inout circuit of the talk box... one or two capacitors would likely fix it... I would try 330 Pf caps first right where the cord comes into the box between the signal and ground points.
The most likely case is that one of the main output transistors (if which there are many) is shorted. When the protect circuit senses DC on the final output, it will not allow the output relay to come on to protect the speakers from raw DC. With the power removed, you can check between each outputs Emitter and Collector and you will probably find close to zero ohms. From that point you need to unsolder each of the pins of the bad channel until you find the shorted device(s) and replace them.
Depending on the model, there are four around that date, it could be the insert jacks are tarnished reducing the signal flow between the pre amp stage and digital power amplifier. It could be the power amplifier has failed. It could even be customer error in wiring.
This assumes there is the correct level of signal entering the input sockets of course.
The Roland RD-600 is a digital piano, and its hammer action mechanism is designed to simulate the feel of an acoustic piano. The hammers in digital pianos like the RD-600 are typically made of materials like plastic or a combination of materials to replicate the weighted feel of acoustic piano keys.
The breaking of hammers in a digital piano is not a common issue, and it's not typically related to the age of the instrument alone. Several factors could contribute to the breakage of hammers, and it's essential to consider the following possibilities:
Excessive Force: If the keys are played with excessive force or if there's any physical damage to the instrument, it could lead to the breakage of hammers.
Material Quality: The quality of materials used in the construction of the hammers can impact their durability. If the hammers are made from subpar materials, they may be more prone to breaking.
Manufacturing Defects: In some cases, there could be manufacturing defects that make the hammers more susceptible to breakage.
Maintenance: Lack of proper maintenance, such as cleaning and regular inspection, may contribute to the wear and tear of components, including hammers.
If you've observed a pattern of hammers breaking with regularity, it might be worth investigating the specific cause. If it's due to excessive force or physical damage, adjusting playing habits and taking care during transport can help mitigate the issue.
As for whether it's worth purchasing new hammers from Roland, it depends on the extent of the damage and the overall condition of the instrument. If the RD-600 is in good condition otherwise and you enjoy playing it, replacing the hammers could be a reasonable option. However, you may want to assess the cost of replacement hammers compared to the overall value of the instrument, factoring in the cost of a used RD-600 and any potential future maintenance needs.
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